Copepod
n. 桡足动物
🗣️ 情景例句
They graduated from high school last year.
他们去年高中毕业。
I don't have the nerve to do it.
我没勇气去做。
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。