膝蓋是很大的話題，討論無數。我是先提高步頻，然後練出肌肉。先看一下教練的兩篇課文：

來源: 布蘭雅於 2022-05-28 21:07:29 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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