Polycations
(polycation 的复数) 聚阳离子
🗣️ 情景例句
Thanks, Richard.
谢谢你 Richard。
It's a windy city.
这是一个多风的城市。
We should learn the value of money and learn how many hours' work has to be done before we can buy something.
我们应该认识到钱的价值，知道要干多少小时的活，我们才能买某件物品。