Cationite
阳离子交换剂
🗣️ 情景例句
He ventured to speak to her.
他鼓起勇气向她说话。
I tried to call Mr. Cooper,but the line was busy.
我试着呼叫库珀先生，但是线老是忙。
Without it we could not make a living.
要是没有这条河，我们就无法生存下去。