Polyethyleneimine
聚乙烯亚胺
🗣️ 情景例句
What are your major and minor subjects?
你主修和副修什么科目？
The chances for a promotion look really good, but before I get too old I want to see the world.
提升的机会确实无可挑剔，但是在我变得太老之前，我想去看看世界。
Then they brushed ink onto the characters.
接着，把墨汁刷在字上。