Polyethylenamine
聚乙烯胺
🗣️ 情景例句
But what?
但是什么？
It's been 5 years since I last saw you.
我已5年没见你了
The chest contained the personal belongings of a seaman, Alan Fielding.
木箱内装有水手艾伦。菲尔丁的私人财物，