Polycation
聚阳离子
🗣️ 情景例句
You're a ... wonderful friend.
你是个……极好的朋友。
What did he ask you?
他问你什么？
They were expecting their sixth child and were faced with even more pressing economic problems.
第6个孩子即将问世，他们面临着更为严峻的经济问题。