When we put a piece of candy into his mouth, the arm must allow the biceps and other muscle coordination to complete.
当我们把一块糖放进嘴里时，就得让手臂上的肱二头肌和其它肌肉协同才能完成。
When we put a piece of candy into his mouth, the arm must allow the biceps and other muscle coordination to complete.
当我们把一块糖放进嘴里时，就得让手臂上的肱二头肌和其它肌肉协同才能完成。
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