我换了一个视频，这个也许清楚些。身体和胳膊之间的合适角度是多少？靠近身体更安全些吗？

来源: kathyzh 于 2024-11-20 16:56:35 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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