Polyfluoride
多氟化物
🗣️ 情景例句
Oh, fine, fine. Be here a few minutes early.
啊， 好， 好。请早几分钟到这。
I'm awfully sorry.
真是对不起。
Sure I was. I'll never forget that.
我当然在那儿了。我永远都不会忘记那次地震。