因为用户吐槽pad磨得太快，所以加了弹簧。

来源: 成功的熊于 2019-09-16 11:53:02 [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.