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车轴主要用来支撑传动零件、传递扭矩和承受载荷。

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An idiom is a form of expression that is particular to a certain person or group of people.

幽蚊幼虫的头部触角可以用于捕食。

Planning the speech is mainly about the subject and the audience you choose.

当发生罕见病是，比值比约等于归因风险