Qac
abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Mr. Nelson.
Nelson先生。
I'm afraid not.
我想不是。
It is four o'clock.In the afternoon, Mrs.Sawyer usually drinks tea in the living room.But this afternoon, she is drinking tea in the garden.
现在是4点钟，下午，索耶夫人通常是在客厅里喝茶，但今天下午，她正在花园里喝茶。