歐幾裏得幾何學的公理體係中，直線，點和平麵等都是不加定義的。

來源: 無牙於 2011-04-26 09:37:23 [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.