Polycation
聚阳离子
🗣️ 情景例句
Sam, would you come in, please?
Sam，请进来一下， 好吗？
Excuse me, but could you give me some change?
劳驾，你能换些零钱给我吗？
When they had all made themselves comfortable, a stranger appeared.
当他们都已安排舒适时，一个陌生人出现了。