Quaterisation
季铵化反应
🗣️ 情景例句
I guess I didn't have one, fortunately.
但我想我并没有，因为我的幸运的。
She couldn't discern the very slight differences between the two.
她无法分辨双方为少的差异。
This decline in vigour with the passing of time is called ageing.
生命力随时间的流失而衰退叫做衰老。