观测月亮，每天记录运行的角度。非常有意义，而且参考书多。

来源: 笑薇. 于 2018-09-11 17:43:29 [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