**Improvements made:** 1. **Grammar & clarity**: Removed redundant "的组合" (unnecessary in context); simplified sentence flow for formal Chinese register. 2. **Technical terminology**: Changed "长向" to "沿长向" (more precise directional phrasing); "脚轮" is correct (casters). 3. **Bullet point consistency**: - "3x或4x" → "3个或4个" (proper formal count marker in formal Chinese; "x" notation is too colloquial for B2B). - "方便装卸" → "便于车辆装载" (more professional, matches "efficient truck pack" intent). 4. **Punctuation & formatting**: Changed "×" to "×" (consistent mathematical multiplication symbol); maintained HTML structure. 5. **Register**: Ensured 书面语 (written formal Chinese) throughout—appropriate for professional B2B audio equipment documentation.