Update README.md

README.md

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-![image/jpeg](https://cdn-uploads.huggingface.co/production/uploads/65d6eb2651e148d01873ec81/8lPaRQm5J7z6tkRqMJrfc.jpeg)
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-The figure depicts the process of air cargo loading, starting with terminal administration, where goods are processed and prepared for transportation.
-Cargo loading follows as goods are transferred to the aircraft, and then flight preparation and flying take place as the plane gets ready for departure. 
-The cargo is carefully organized in the Unit Load Devices (ULD), which are containers or pallets used to carry the cargo efficiently. 
-For wide-body aircraft cargo holds, like the B777, there are designated areas for both small ULD containers and larger pallets. 
-Meanwhile, narrow-body aircraft cargo holds, like the A320, have a different arrangement suited for smaller loads.
-The cargo types include bulk cargo and special goods, which require specific handling due to their size, fragility, or value.
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+![image](https://cdn-uploads.huggingface.co/production/uploads/65d6eb2651e148d01873ec81/ERWIO61tM-7kmiwPOKDKc.png)
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+This figure illustrates an air cargo loading scenario comprising three parts: (1) *Air cargo* has two types: bulk cargo, which consists of individual sub-cargoes, and Unit Load Devices (ULDs), which are pre-packed standardized containers. (2) *Cargo holds* accommodate bulk cargoes (e.g., narrow-body aircraft such as the A320) and ULDs (e.g., wide-body aircraft such as the B777). Notably, when loaded into bulk cargo holds, different cargo detaching granularities produce a massive number of loading options.
+(3) *Constraints* determine the feasibility of loading operations, including cargo constraints, cargo hold constraints, and loading operation constraints. In this figure's example, the flight has two destinations, and hence the ULDs are categorized into two segments. Such multi-segment cargo loading further complicates the combinatorial optimization problem.
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