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La luz y el calor que emana de las estrellas se genera cuando se unen (o fusionan) los átomos de hidrógeno para dar lugar a elementos más pesados.	[ "Stars give off light and heat because of the energy made when hydrogen atoms are merged (or fused) together to form heavier elements." ]	[ "Stars did not give off light and heat because of the energy made when hydrogen atoms are merged (or fused) together to form heavier elements.", "Stars give off light and heat because of the energy made when hydrogen atoms are merged (or fused) together to form light elements." ]	spa_Latn
Los científicos concentran su trabajo en desarrollar un reactor capaz de generar energía de la misma forma.	[ "Scientists are working to create a reactor that can make energy in the same way." ]	[ "Scientists are not working to create a reactor that can make energy in the same way.", "Scientists are working to create a reactor that can make energy in the other way.", "Scientists are working to create a reactor that will make energy in the same way." ]	spa_Latn
Sin perjuicio de ello, es un problema de muy difícil solución y no será factible lograr la construcción de reactores de fusión útiles sino hasta dentro de muchos años.	[ "This, however, is a very hard problem to solve and will take many years before we see useful fusion reactors built." ]	[ "This, however, is a very easy problem to solve and will take few years before we see useless fusion reactors built.", "This, however, is a very hard problem to solve and will take many years before we see useful fusion reactors did not built.", "This, however, is no very hard problem to solve and will take man...	spa_Latn
La tensión superficial provoca que la aguja permanezca flotando sobre el agua.	[ "The steel needle floats on top of the water because of surface tension." ]	[]	spa_Latn
La tensión superficial se produce debido a que las moléculas de agua en su superficie se atraen con mucha más intensidad que las moléculas de aire suspendidas por encima de ellas.	[ "Surface tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the air molecules above them." ]	[ "Adegundia tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the air molecules above them.", "Baol tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the...	spa_Latn
Las moléculas de agua forman una película invisible sobre su superficie que permite que objetos como las agujas floten encima de ella.	[ "The water molecules make an invisible skin on the water’s surface that allows things like the needle to float on top of the water." ]	[ "The water molecules did not make an invisible skin on the water’s surface that allows things like the needle to float on top of the water.", "The water molecules make an visible skin on the water’s surface that allows things like the needle to float on top of the water." ]	spa_Latn
La hoja de los patines para hielo modernos cuenta con un filo de dos bordes separados por un espacio cóncavo entre ellos, lo que permite una mejor adherencia al hielo, incluso al estar inclinada.	[ "The blade on a modern ice skate has a double edge with a concave hollow between them. The two edges allow for a better grasp of the ice, even when tilted." ]	[ "The blade on a modern ice skate has a double edge with a concave hollow between them. The eight edges allow for a better grasp of the ice, even when tilted.", "The blade on a modern ice skate has a double edge with a concave hollow between them. The four edges allow for a better grasp of the ice, even when tilte...	spa_Latn
Como la parte inferior de la cuchilla está levemente curvada, al inclinarla hacia un lado o el otro, el borde que queda en contacto con el hielo también se curva.	[ "Because the bottom of the blade is slightly curved, as the blade tilts to one side or the other, the edge which is in contact with the ice also curves." ]	[ "Because the bottom of the blade is slightly curved, as the blade tilts to one side or the same, the edge which is in contact with the ice also curves.", "Because the bottom of the blade is slightly not curved, as the blade tilts to one side or the other, the edge which is in contact with the ice also curves." ]	spa_Latn
Esto hace que el patinador gire. Cuando los patines se inclinan hacia la derecha, el patinador también gira en esa dirección; si lo hacen hacia la izquierda, girará hacia la izquierda.	[ "This causes the skater to turn. If the skates tilt to the right, the skater turns right, if the skates tilt to the left, the skater turns left." ]	[ "This causes the skater to turn. If the skates tilt to the right, the skater did not turn right, if the skates tilt to the left, the skater turns left.", "This causes the skater to turn. If the skates tilt to the right, the skater turns left, if the skates tilt to the left, the skater turns left.", "This did no...	spa_Latn
Para recuperar el nivel de energía previo, deben deshacerse de la adicional que recibieron de la luz.	[ "To return to their previous energy level, they must get rid of the extra energy they got from the light." ]	[ "To not return to their previous energy level, they must get rid of the extra energy they got from the light." ]	spa_Latn
Se hace al emitir una pequeña partícula de luz llamada «fotón».	[ "They do this by emitting a tiny particle of light called a \"photon\"." ]	[ "They do no by emitting a tiny particle of light called a \"photon\"." ]	spa_Latn
Los expertos denominan a este proceso «emisión estimulada de radiación», ya que la luz brillante estimula a los átomos, lo que genera la emisión de un fotón de luz, que es un tipo de radiación.	[ "Scientists call this process \"stimulated emission of radiation\" because the atoms are stimulated by the bright light, causing the emission of a photon of light, and light is a type of radiation." ]	[ "Scientists call this process \"stimulated emission of radiation\" because the atoms are stimulated by the dull light, causing the emission of a photon of light, and light is a type of radiation.", "Scientists did not call this process \"stimulated emission of radiation\" because the atoms are stimulated by the b...	spa_Latn
En la imagen que sigue se ilustran átomos que emiten fotones. Claro está, estos son, en verdad, de un tamaño mucho menor que los de la imagen.	[ "The next picture shows the atoms emitting photons. Of course, in reality photons are a lot smaller than those in the picture." ]	[ "The next picture did not show the atoms emitting photons. Of course, in reality photons are a lot smaller than those in the picture.", "The next picture shows the atoms emitting photons. Of course, in reality photons are a lot large than those in the picture.", "The next picture shows the atoms emitting photon...	spa_Latn
¡El tamaño de los fotones es incluso menor que el de la materia que compone los átomos!	[ "Photons are even smaller than the stuff that makes up atoms!" ]	[ "Photons are even large than the stuff that makes up atoms!", "Photons are even not smaller than the stuff that makes up atoms!" ]	spa_Latn
Tras funcionar por cientos de horas, el filamento en el foco eventualmente se quema y esta deja de funcionar.	[ "After hundreds of hours of operation the filament in the bulb eventually burns out and the light bulb no longer works." ]	[]	spa_Latn
Luego, la bombilla debe cambiarse. Es necesario ser cuidadosos en el reemplazo.	[ "The light bulb then needs replacing. It is necessary to be careful in replacing the light bulb." ]	[ "The light bulb then needs replacing. It is unnecessary to be careful in replacing the light bulb.", "The light bulb then needs replacing. It is unnecessary to be careless in replacing the light bulb." ]	spa_Latn
Lo primero que se debe hacer con la lámpara es apagar su interruptor o desconectarla.	[ "First, the switch for the light fixture needs to be turned off or the cable disconnected." ]	[ "Eighth, the switch for the light fixture needs to be turned off or the cable disconnected.", "Eleventh, the switch for the light fixture needs to be turned off or the cable disconnected.", "Fifteenth, the switch for the light fixture needs to be turned off or the cable disconnected.", "Fifth, the switch for ...	spa_Latn
Esto ocurre porque la electricidad que corre hacia el casco en donde se inserta la parte metálica del foco puede causar una descarga eléctrica grave si se toca el interior de ese casco o la base de metal del foco mientras aún está parcialmente en el casco.	[ "This is because electricity flowing into the socket where the metallic part of bulb sits can give you a severe electric shock if you touch the inside of the socket or the metal base of the bulb while it is still partly in the socket." ]	[ "This is because electricity flowing into the socket where the metallic part of bulb sits will give you a severe electric shock if you touch the inside of the socket or the metal base of the bulb while it is still partly in the socket.", "This is because electricity flowing into the socket where the nonmetallic p...	spa_Latn
El corazón, que bombea la sangre, es el órgano más importante del sistema circulatorio.	[ "The major organ of the circulatory system is the heart, which pumps the blood." ]	[ "The major organ of the circulatory system is no heart, which pumps the blood.", "The minor organ of the circulatory system is the heart, which pumps the blood." ]	spa_Latn
La sangre fluye desde el corazón a través de unas vías llamadas arterias y regresa a éste por otras denominadas venas. Los conductos más pequeños de todos reciben el nombre de capilares.	[ "Blood goes away from the heart in tubes called arteries and comes back to the heart in tubes called veins. The smallest tubes are called capillaries." ]	[ "Adapted goes away from the heart in tubes called arteries and comes back to the heart in tubes called veins. The smallest tubes are called capillaries.", "Aegae goes away from the heart in tubes called arteries and comes back to the heart in tubes called veins. The smallest tubes are called capillaries.", "Ahu...	spa_Latn
Con su dentadura, un triceraptops hubiese podido triturar no solo hojas, sino además ramas y raíces muy duras.	[ "A triceratops' teeth would have been able to crush not only leaves but even very tough branches and roots." ]	[ "A triceratops' teeth would have been unable to crush not only leaves but even very tender branches and roots." ]	spa_Latn
Según creen algunos científicos, la alimentación del Tricerátops era a base de cícadas, un tipo de planta común en el período Cretácico.	[ "Some scientists think Triceratops ate cycads, which are a type of plant that was common in the Cretaceous." ]	[ "Some scientists did not think Triceratops ate cycads, which are a type of plant that was common in the Cretaceous.", "Some scientists think American Seabees ate cycads, which are a type of plant that was common in the Cretaceous.", "Some scientists think Archives ate cycads, which are a type of plant that was ...	spa_Latn
Estas plantas se asemejan a una pequeña palmera con una corona de hojas filosas y puntiagudas.	[ "These plants look like a small palm tree with a crown of sharp, spiky leaves." ]	[ "These plants did not look like a small palm tree with a crown of sharp, spiky leaves.", "These plants look like a big palm tree with a crown of dull, spiky leaves.", "These plants look like a large palm tree with a crown of dull, spiky leaves." ]	spa_Latn
El Triceráptors podría haber arrancado las hojas con su robusto cuerno en lugar de comerse el tronco.	[ "A Triceratops could have used its strong beak to strip off the leaves before eating the trunk." ]	[ "A Triceratops could have not used its strong beak to strip off the leaves before eating the trunk.", "A Triceratops could have used its weak beak to strip off the leaves before eating the trunk.", "A Triceratops had used its strong beak to strip off the leaves before eating the trunk." ]	spa_Latn
Otros científicos sostienen que son pocas las probabilidades de que algún dinosaurio se alimentara con estas plantas, dado que son altamente venenosas; no obstante, en la actualidad, el perezoso y otras especies, como el loro (que descienden de los dinosaurios), pueden ingerir hojas o frutos venenosos.	[ "Other scientists argue that these plants are very poisonous so it is unlikely that any dinosaur ate them, even though today the sloth and other animals like the parrot (a descendant of the dinosaurs) can eat poisonous leaves or fruit." ]	[ "Other scientists argue that these plants are very poisonous so it is not unlikely that any dinosaur ate them, even though today the sloth and other animals like the parrot (a descendant of the dinosaurs) can eat poisonous leaves or fruit.", "Other scientists argue that these plants are very poisonous so it is un...	spa_Latn
¿Qué efecto tendría en mí la gravedad de Io? Si usted se encontrara en la superficie del satélite, su peso sería menor que en la Tierra.	[ "How would Io's gravity pull on me? If you stood on the surface of Io, you would weigh less than you do on Earth." ]	[ "How would Io's gravity pull on me? If you stood on the surface of A7, you would weigh less than you do on Earth.", "How would Io's gravity pull on me? If you stood on the surface of Adapted, you would weigh less than you do on Earth.", "How would Io's gravity pull on me? If you stood on the surface of Autumn, ...	spa_Latn
Alguien cuyo peso en la Tierra es de 200 libras (90 kg) en Ío pesaría cerca de 36 libras (16 kg). Ello significa, claro está, que su gravedad ejerce menos atracción.	[ "A person who weighs 200 pounds (90kg) on Earth would weigh about 36 pounds (16kg) on Io. So the gravity, of course, pulls less on you." ]	[ "A person who weighs 0 bitcoins (90kg) on Earth would weigh about 0 bitcoins (16kg) on Io. So the gravity, of course, pulls less on you.", "A person who weighs 100 pounds (170kg) on Earth would weigh about 38 pounds (21kg) on Io. So the gravity, of course, pulls less on you.", "A person who weighs 100 pounds (6...	spa_Latn
El Sol no tiene una corteza como la Tierra, sobre la que uno pueda pararse. Está compuesto en su totalidad por gases, fuego y plasma.	[ "The Sun doesn't have a crust like the Earth that you can stand on. The whole Sun is made out of gases, fire, and plasma." ]	[ "The America Press doesn't have a crust like the Earth that you can stand on. The whole Sun is made out of gases, fire, and plasma.", "The Armageddon doesn't have a crust like the Earth that you can stand on. The whole Modbury Hotel is made out of gases, fire, and plasma.", "The BK3 doesn't have a crust like th...	spa_Latn
A medida que pierde proximidad con el sol, el gas se vuelve más ligero.	[ "The gas becomes thinner as you go farther from the center of the Sun." ]	[ "The gas becomes thick as you go farther from the center of the Sun.", "The gas becomes thinner as you go farther from the center of the Admiral Farragut Academy.", "The gas becomes thinner as you go farther from the center of the Asiatic Society.", "The gas becomes thinner as you go farther from the center o...	spa_Latn
La parte externa que puede observarse al dirigir la vista al sol se llama fotósfera; esto es, «esfera de luz».	[ "The outer-part we see when we look at the Sun is called the photosphere, which means \"ball of light\"." ]	[ "The inner-part we see when we look at the Sun is called the photosphere, which means \"ball of light\".", "The outer-part we see when we look at the BVK is called the photosphere, which means \"ball of light\".", "The outer-part we see when we look at the Bayards is called the photosphere, which means \"ball o...	spa_Latn
Cerca de tres mil años después, en 1610, el astrónomo italiano, Galileo Galilei, pudo observar, a través del telescopio, que Venus tenía fases, tal y como las tiene la luna.	[ "About three thousand years later, in 1610, Italian astronomer Galileo Galilei used a telescope to observe that Venus has phases, just as the moon does." ]	[ "About three thousand years later, in 1604, Italian astronomer Galileo Galilei used a telescope to observe that Venus has phases, just as the moon does.", "About three thousand years later, in 1605, Italian astronomer Galileo Galilei used a telescope to observe that Venus has phases, just as the moon does.", "A...	spa_Latn
Las fases se producen porque solo se ilumina la cara de Venus (o de la luna) que mira hacia el sol. Este fenómeno apoyó la teoría copernicana de que los planetas orbitan al sol.	[ "Phases happen because only the side of Venus (or of the Moon) facing the Sun is lighted. The phases of Venus supported the theory of Copernicus that the planets go around the Sun." ]	[ "Phases did not happen because only the side of Venus (or of the Moon) facing the Sun is lighted. The phases of Venus supported the theory of Copernicus that the planets go around the Sun.", "Phases happen because only the side of Akin (or of the Mistick) facing the Sun is lighted. The phases of Vagen supported t...	spa_Latn
Posteriormente, en 1639, Jeremiah Horrocks, un astrónomo oriundo de Inglaterra, logró ver un tránsito de Venus.	[ "Then, a few years later in 1639, an English astronomer named Jeremiah Horrocks observed a transit of Venus." ]	[ "Then, a few years later in 1639, an Allegheny astronomer named Marco Chavez observed a transit of Markinch.", "Then, a few years later in 1639, an Americanisation astronomer named Jeremiah Horrocks observed a transit of Treaty.", "Then, a few years later in 1639, an Archagathus astronomer named Dhanpalthan obs...	spa_Latn
Luego de reconquistar Danelaw, Inglaterra había disfrutado de un prolongado período pacífico.	[ "England had experienced a long period of peace after the reconquest of the Danelaw." ]	[ "Aghor had experienced a long period of peace after the reconquest of the Mingulay.", "Alpiglen had experienced a long period of peace after the reconquest of the Danelaw.", "Aniversario had experienced a long period of peace after the reconquest of the Danelaw.", "Aparat had experienced a long period of peac...	spa_Latn
No obstante, en 991, Ethelred luchó contra la flota vikinga más grande desde la de Guthrum, del siglo anterior.	[ "However in 991 Ethelred was faced with a Viking fleet larger than any since Guthrum's a century earlier." ]	[ "However in 1000 Ethelred was faced with a Viking fleet larger than any since Guthrum's a century earlier.", "However in 982 Ethelred was faced with a Viking fleet larger than any since Guthrum's a century earlier.", "However in 983 Ethelred was faced with a Viking fleet larger than any since Guthrum's a centur...	spa_Latn
Olaf Trygvasson, un noruego con avidez de recuperar su nación del dominio danés, era el líder de la flota.	[ "This fleet was led by Olaf Trygvasson, a Norwegian with ambitions to reclaim his country from Danish domination." ]	[ "This fleet was led by Air21, a Pisano with ambitions to reclaim his country from Valera domination.", "This fleet was led by Alien Shores, a Gobots with ambitions to reclaim his country from Danish domination.", "This fleet was led by Andre Dozzell, a Norwegian with ambitions to reclaim his country from Beltra...	spa_Latn
Luego de enfrentar contratiempos militares iniciales, Etelredo logró arribar a un acuerdo con Olaf, quien volvió a Noruega para intentar ganar su reino, con resultados dispares.	[ "After initial military setbacks, Ethelred was able to agree to terms with Olaf, who returned to Norway to try to gain his kingdom with mixed success." ]	[ "After initial civilian setbacks, Ethelred was unable to agree to terms with Olaf, who returned to Norway to try to gain his kingdom with mixed success.", "After initial military setbacks, Abinger was able to agree to terms with Alversund, who returned to Soviet Russia to try to gain his kingdom with mixed succes...	spa_Latn
El alfabeto coreano es el único diseñado en forma deliberada que aún se utiliza a diario popularmente. Se inventó en 1444, durante el reinado de Sejong (1418 a 1450).	[ "Hangeul is the only purposely invented alphabet in popular daily use. The alphabet was invented in 1444 during the reign of King Sejong (1418 – 1450)." ]	[ "Accord is the only purposely invented alphabet in popular daily use. The alphabet was invented in 1444 during the reign of King Navon (1418 – 1450).", "Acid is the only purposely invented alphabet in popular daily use. The alphabet was invented in 1444 during the reign of King Sejong (1418 – 1450).", "Amport i...	spa_Latn
Sejong fue el monarca número cuatro de la dinastía Joseon y uno de los que ganó mayor respeto.	[ "King Sejong was the fourth king of the Joseon Dynasty and is one of the most highly regarded." ]	[ "King Abingdon Twickenham was the fourth king of the Union Solidarity and is one of the most highly regarded.", "King Alan K. Simpson was the fourth king of the SD National Guard and is one of the most highly regarded.", "King Alaska PAFL was the fourth king of the Federal Aviation and is one of the most highly...	spa_Latn
El nombre original que se le dio al alfabeto Hangeul fue Hunmin Jeongeum, que significa «los sonidos adecuados para instruir al pueblo».	[ "He originally named the Hangeul alphabet Hunmin Jeongeum, which means \"the correct sounds for the instruction of the people\"." ]	[ "He originally named the AIHA alphabet Hunmin Jeongeum, which means \"the correct sounds for the instruction of the people\".", "He originally named the AKG alphabet Hunmin Jeongeum, which means \"the correct sounds for the instruction of the people\".", "He originally named the Abbas alphabet Cannibal Ox, whic...	spa_Latn