这样可以稳定上下颌，这样骨头就不会收缩使你的脸看起来很老。
It stabilizes the jaw so the bone doesn't shrink and make your face look older.
腿部的肌肉群很大以至于肌肉整体不会收缩，他说。
The muscles in the legs are so large that the whole muscle does not contract, he says.
腿部的肌肉群很大以至于肌肉整体不会收缩，他说。
The muscles in the legs are so large that the whole muscle does not contract, he says.
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