Arquad
卤化烷基三甲基铵(阳离子表面活性剂), 季铵盐萃取剂
🗣️ 情景例句
I estimate his age to be about 30.
我估计他的年龄大约30岁。
I'm from out of town.
我从城外面来。
We'd better catch a bus. I'll go with you.
我们还是搭公共汽车去好。我跟你一块去。