我換了一個視頻，這個也許清楚些。身體和胳膊之間的合適角度是多少？靠近身體更安全些嗎？

來源: kathyzh 於 2024-11-20 16:56:35 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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