Qac
abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
This place really sucks. I want to go somewhere else.
这地方真差。我想到别处去。
One may think that dares not speak.
人可思其不敢言者。
What's wrong with you?
你怎么回事？