Polyanion
聚阴离子
🗣️ 情景例句
Thank you for a most enjoyable evening.
谢谢你举办这样一个极其快乐的晚会。
I'm afraid you're being too particular about your food.
我害怕你太讲究你的食物。
We had some shoes like those a month ago,but we don't have any now.
一个月前我们有这要的鞋。但是现在没有了。