Precondensate
[化] 预缩合; 预缩合物
🗣️ 情景例句
I heard the professor of that class is very good.
我听说那个班的教授很好。
Youth is a blunder; manhood a struggle, old age a regret.
青年冒失莽撞；成年发奋图强；老年遗憾懊丧。
New York never sleeps.
纽约是一座不眠的城市。