Polyvinylamine
聚乙烯胺; 聚乙烯胺
🗣️ 情景例句
I have been exposed to languages such as English, Spanish, and French.
我接触过英语、西班牙语和法语。
How can it be so small and heavy?
这样小何以这么重呀？
He was obviously very nervous and for some minutes stood awkwardly before the microphone.
他显然非常紧张，局促不安地在麦克风前站了好几分钟。