Polysulfonate
多磺酸盐
🗣️ 情景例句
You have to ask for my father's permission.
你必须征得我父亲的同意。
This is Lesson One.
这是第一课。
There is space for summer picnics, open-air concerts, plays and games.
这儿有空旷的地方，供作夏日野餐、露天音乐会、各种娱乐和竞赛之用。