Polyvinylamine
聚乙烯胺; 聚乙烯胺
🗣️ 情景例句
We're going to take it slow first.
开头我们要做慢一点。
A little of every thing is nothing in the main.
每事浅尝辄止，事事都告无成。
Is she coming later?
她晚些时候会来吗？