如果是純粹的直線的話，跑步通過比慢走應該更不容易摔倒。騎過車或滑過雪的人會有這個感覺。

來源: intools 於 2018-02-01 11:22:36 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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