Place napkins on the chair seat or arm when briefly stepping away.
起身离开座位时，将餐巾放在椅子上或扶手上。
Bracelet: an ornamental band or chain encircling the wrist or arm.
手镯：环绕手腕或手臂的装饰带或装饰环。
He could fall off and break a leg or arm.
他可能摔倒，摔断腿或胳膊。
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。
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。
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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