展开手臂将前臂和手都放在地板上。

Unroll the arm to rest the forearm and hand completely on the floor.

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前臂和手中的小肌肉是用以使手、指头活动。

Forearm and small muscles in the hand move the hand and fingers.

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前臂和手中的小肌肉是用以使手、指头活动。

Forearm and small muscles in the hand move the hand and fingers.

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