Qac
abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Congratulations!
恭喜你
This year I'm in a co-ed dorm.
今年我住在男女生合住的宿舍。
Now, smoke still rose up from the warm ground over the desolate hills.
而现在，发热的地面上仍然升腾着烟雾，弥漫在荒凉的山丘上。