Quaternarization
[化] 季铵化作用; 门秀金反应
🗣️ 情景例句
Think about the word and use it, in your mind, in a sentence.
想想这个字，然后去用它，在脑子里，在句子里。
I wonder if it is possible to arrange shopping for us.
我想能否在我们访问结束时为我们安排一点时间购物。
Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
某些大公司进行的研究属于一般和基础性的研究。因此不保密对他们才有利。