Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Hold it, Robbie!
停停， Robbie！
He who purposes to be an author, should first be a student.
想当作家，相当学生。
We'll see.
再说吧。