Qac
abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Yes. It works!
不错。有效！
I'm too busy.
我太忙。
good-tempered elephant who will give many years of loyal service.
脾气温顺、能忠实为人服务多年的大象。