Polycation
聚阳离子
🗣️ 情景例句
How much does a round trip ticket to go there cost?
一张去那边的往返票要多少钱？
When the fruit is scarcest, its taste is sweetest.
物以稀为贵。
You really have an ear for pop music.
你确实对流行音乐很有欣赏力。