About 40 percent reported hand or arm symptoms, mostly from tendinitis.

约有百分之四十出现手或手臂的症状，其中大部分来自肌腱炎。

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However, assistant devices are needed to construct joint or arm with PMA, which increases the volume and weight. This makes the structure bigger and the control more difficult.

但是PMA还需要其他辅助机构才能构成关节和手臂，使用中增加了体积、重量，也给结构设计和控制带来不便。

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However, assistant devices are needed to construct joint or arm with PMA, which increases the volume and weight. This makes the structure bigger and the control more difficult.

但是PMA还需要其他辅助机构才能构成关节和手臂，使用中增加了体积、重量，也给结构设计和控制带来不便。

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