理论上讲，会无限缩小下去，乒乓球太大了

来源: why66 于 2008-09-15 15:27:26 [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.