怎麽看著像是栽髒。什麽叫trace? 而且那物質是化學原料，可以生產其它產品。

來源: FollowNature 於 2023-05-06 05:46:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.