Polychlorohydrocarbon
多氯代烃
🗣️ 情景例句
What I'm trying to say ...
我想说……
The old goose plays not with foxes.
老鹅不和狐狸一起玩。
Sorry! It's not a very good line. Could you speak more clearly, please?
对不起！电话线路不太好。你能说清楚一些吗？