这节课是一周最吵的 » This lesson the most noisy of the week 扩大交际面 » Expanded Association 通过对齿轮的优化设计大大减轻了齿轮的质量(或体积) » Optimal Design of gear by greatly reducing the quality of gear (or vo...
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Expand the communication area
扩大交际面 » Expand the communication area ..
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