因為後輪是刹車鼓，刹車效率低。

來源: giddyup 於 2012-07-07 15:15:46 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.