Polyvinylamine
聚乙烯胺; 聚乙烯胺
🗣️ 情景例句
I believe stamp collecting is an interesting hobby.
我认为收集邮票是一种有趣的爱好。
9:25 on Track 12.
9点25分，12轨道。
he always insisted that it should be written out in full.
但他还是坚持要求将信的全文写在信纸上。