折弯的应该是助行车上的装置，在a和b上也能看得到。

来源: 桑木扁担于 2014-02-17 19:13:46 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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

Change Ad Consent