Polycation
聚阳离子
🗣️ 情景例句
Sorry, but she is out for lunch right now.
抱歉，她现在出去吃午饭了。
No. Can't you see that rocket is almost falling down.
不。你不知道火箭快要倒下来了吗？
'Well, I'd prefer to stay here,' I said.
“可我更愿意呆在这儿，”我说，