Pentafluorinated
五氟化的
🗣️ 情景例句
You have a good command of English.
你的英语水平很好。
First, Mr. Stone Lee, our sales manager, will make a few remarks.
首先，请我们销售经理世通先生发表讲话。
Hardly anyone can positively enjoy sitting in a train for more than a few hours.
很少有人能够真正喜欢坐几个小时以上的火车。