Polycation
聚阳离子
🗣️ 情景例句
Will you marry me?
你能嫁给我吗？
Mother begins baking cookies two weeks before Christmas.
自圣诞节的两周以前，母亲就开始做小甜饼了。
Yes, we might have to do that.
是呀，恐怕只有这么做了。