Update README.md

README.md

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 ## Key Features / 核心特点
 
-- **Optical ground truth** – sub-mm accuracy, 120 fps, no estimation errors.<br><small>**光学真值** – 亚毫米精度，120 fps，无累计误差。</small>
+- **Optical ground truth** – sub-mm accuracy, 120 fps, no estimation errors.<sub>**光学真值** – 亚毫米精度，120 fps，无累计误差。</sub>
 - **Dexterous hands** – 20+ DoF per hand, synchronized with object 6DOP pose.  
   <small>**灵巧手数据** – 每只手 20+ 自由度，与物体 6 DOP 同步。</small>
 - **Robot-ready** – pre-retargeted to Unitree G1; custom retargeting available.