Poly(vinyl fluoride)
[化] 聚氟乙烯
🗣️ 情景例句
She has nobody she can turn to.
她求助无门。
How often did I tell you not to speak so loud?
我告诉你多少次不要讲话这么大声?
I have one here, Mr. Wu.
我这里有一把，吴先生。