Polyvinylamine
聚乙烯胺; 聚乙烯胺
🗣️ 情景例句
Oh, it was no trouble.
哦 没什么麻烦。
She requests your presence at the conference.
她恳求你们参加会议。
Suddenly someone shouted.'It's two minutes past twelve! The clock has stopped!'
“已经12点零2分了！那钟已经停了！”