Polyolefine
[化] 聚烯烃
🗣️ 情景例句
You've been a great help.
你帮了大忙。
He might have been held up in a traffic jam.
他可能因交通阻塞而耽搁了。
I don't know his number. Did you write it down?
我不知道他的电话号码。你记下来了吗？