Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
This job is back-breaking work.
这份工作强度很大。
No. That's nog good either. But give me your number and I'll call you if somebody cancels.
不。也不行。不过请你把电话号码给我，如果友人取消约会，我就打电话通知你。
Two heads are better than one.
人多智广。