Polyfluoride
多氟化物
🗣️ 情景例句
Right now, we should clean up this room.
现在， 我们应当清理一下房间。
Do your children go to school yet?
府上的孩子们已经上学了吗？
He waited until the volcano became quiet and he was able to return two days later.
他等到火山平静下来，两天以后又返回去。