学习了. 一个是外生的,偶发的. 一个是内生的, 累积的.

来源: 幕鼓晨钟于 2023-04-23 05:54:17 [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.