Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
We formed a very favorable impression of her.
我们对她的印象极好。
All things must come to an end.
天下无不散的筵席。
Here you are, Jim. You must look after your clothes!
给你，你要好好保管你的衣服呀！