Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
No harm done.
没什么。
Hold on.
等一会儿。
They leave unwanted objects in drawers, cupboards and attics for years,
他们在抽屉里，碗柜中、阁楼上堆放着一些不用的东西，一放就是好几年，