Polyethyleneimine
聚乙烯亚胺
🗣️ 情景例句
How much for a haircut?
理发多少钱？
He's tired because he worked hard all day today.
他疲倦是因为他今天整天努力工作。
Sometimes were go upstream to a favourite backwater, sometimes we have our party at the boathouse,
有时，我们溯流而上来到我们喜爱的回水河汊举办；有时在船坞举办。