Polyacetaldehyde
聚乙醛
🗣️ 情景例句
I feel as if we've met each other before.
我觉得我们以前见过面。
One hour's sleep before midnight is worth three after.
午夜前睡一小时抵得上午夜后睡三小时。
Some of us do not know much about the theatre.
我们中有些人还不太懂戏剧。