Polyethylenamine
聚乙烯胺
🗣️ 情景例句
If someone doesn't buy it before then,
如果在此之前没有人买走的话。
I think it's going to be too cold.
我认为天气将会太冷。
as Walter Sullivan has put it in his excellent book, We Are not Alone.
正如沃尔特·沙利文在其杰作《我们并不孤独》中阐述的。