这就象力学，有公式后才变成一个学科。要不然只是些感性认识。

来源: QualityWithoutName 于 2021-09-10 12:47:45 [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.