Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
Yes, we have. For how many?
有，要几张？
Frugality is an estate alone.
仅仅节约就是一笔财产。
hold the string so that the weight nearly touches the ground.
让重物几乎接触地面。