The ribs spread gradually from the first rib so as to allow space for the elbows to move close to the body.

肋骨的扩张度从第一条肋骨开始逐渐展开，可以使肘部贴近身体自由的运动。

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The ribs spread gradually from the first rib so as to allow space for the elbows to move close to the body.

肋骨的扩张度从第一条肋骨开始逐渐展开，可以使肘部贴近身体自由的运动。

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