Polyethylenes
(polyethylene 的复数) n. 聚乙烯\\n[化] 聚乙烯
🗣️ 情景例句
To do what?
做什么呢？
My brother wants to learn how to sail a boat.
我的兄弟要去学操纵帆船。
I don't know whether you realize it, but this condition is essential to us.
我不知道你是否了解，但是，这个条件对我们是必要的。