__________连接机身和腕部，主要作用是改变手部的空间位置，满足机器人的作业空间，并将各种载荷传递到机身。
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Life without ________ can be called life.
Travel give us a _________ to know those differences.
You can either travel or read ,but either your ______ or ______must be on the way.
____________ 生态旅游_____________ 生态系统
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