Qacs
(qac 的复数) abbr. quaternary ammonium compound 季铵化合物（杀菌剂）
🗣️ 情景例句
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很好，请填写这张表格。
What shall I send him for his the New Year?
我要送他什么东西作为新年礼物？
But these are not analogous to what happens when man ages.
不过，这些衰老的情况同人并不相似。