Quaternization
(=quaternarization)季铵化作用, 成季碱反应
🗣️ 情景例句
I was expecting him here at five forty-five.
我们约好了五点四十五在这里会面的。
Good evening,Mrs. Brown.
晚上好，布朗夫人。
but each year, the dogs are still sent out into the snow whenever a traveller is in difficulty.
但每年还要派狗到雪山地里去帮助那些遇到困难的旅游者，