Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Things here work very differently from back home.
这里的情况与你国家的情况有很多不同。
Have you ever thought about becoming a professional musician?
你曾经想过要成为职业音乐家吗？
who rolled balls down inclined planes,
他就是那个使球体沿斜面向下滚动，