rear mirror extension arm.
望后镜长臂
apparatus for nail extension for arm
手臂钢针牵引器
Extension of the injured arm was painful.
把受伤得胳膊伸展开是很疼得。
The friction arm is an extension of the pedal itself, and moves as the pedal is moved.
磨擦杆外接在踏板上，与踏板共同移动。
Upper arm is about equal in length to the shoulder blade in order to allow for good extension.
上臂长度约等于肩胛骨, 以便为良好的扩展性。
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