Qac
abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Don't worry, it's in the bag.
不用担心， 这事儿十拿九稳。
After that,I go downstairs to the kitchen to have breakfast.
在那以后，我去楼下厨房吃早餐。
Our school covers 100 square meters.
我们学校占地面积平方米。