Qac
abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
They always were,
他们过去如此，
This is it. That's $9.15, please.
到了。请付9。15美元。
What's wrong with these eggs?
这些蛋是怎么回事呀？