没有什么意义。首先要定义什么是重大发明再来说数量。

来源: huntridge 于 2019-10-30 15:00:06 [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