想多了。我们呼吸的空气，用的水都是循环使用的。地球上古往今来多少生物循环

来源: gladys 于 2023-06-03 17:05:50 [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.