Cationite
阳离子交换剂
🗣️ 情景例句
Don't ask why; just do as you are told.
别问为什么， 按要求去做就行了。
I know the boy whose father is a manager.
我知道那个男孩的父亲是经理。
Most business letters around the world are written in English.
世界上大多数商务信函都是用英语写的。