Polyacetaldehyde
聚乙醛
🗣️ 情景例句
I don't appreciate your advances towards me.
我真的不喜欢你来搭讪。
How often did I tell you not to yell in the house?
我告诉你多少次不要在房子里大叫?
Then knowledge began to be accumulated according to a systematic plan.
于是，知识便开始有系统有计划地积累起来。