Substract
vt. 减去
🗣️ 情景例句
How were your scores in university?
你大学时的成绩如何？
I'm doing it for you!
我这样还不是为你好！
below 20 per cent, its bactericidal action is negligible.
浓度低于20％时，杀菌能力基本上就不存在了。