这是个哲学问题，对有些人来说有一定程度的难度。

来源: 方家胡同于 2019-01-29 06:35:01 [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.