Polyvinylamine
聚乙烯胺; 聚乙烯胺
🗣️ 情景例句
Everyone gets a turn, going counterclockwise,
每一个人按逆时针方向，
Why are you so much taller than I?
你为什么个子比我高那么多？
I can't believe your never.
你好大的胆子！