When you choose mountain bike, it is a good idea to learn more about the gearing systems.
当您选择山地自行车，这是一个好主意，更多地了解齿轮系统。
This paper deals with a new design philosophy of naval gearing systems in the near future.
本文叙述了未来几年内舰船齿轮装置设计的新思想。
This paper deals with a new design philosophy of naval gearing systems in the near future.
本文叙述了未来几年内舰船齿轮装置设计的新思想。
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