Quaternization
(=quaternarization)季铵化作用, 成季碱反应
🗣️ 情景例句
There's nobody here!
这里一个人都没有
A bad padlock invites a picklock.
开门揖盗。
About once a month. Not too often, because neither of us has much time. We both have too much work to do.
大约每月一次。不太经常写信，因为我俩的时间都很紧。我们都有做不完的事。