Amberplex
离子交换膜
🗣️ 情景例句
Let's talk business.
我们来谈谈正经事。
He is distinguished as an economist.
他是一名著名的经济学家。
He asked very politely, Excuse me, have you got any books about the moon and the stars?
“请问，你有关于月亮和星星的书吗？”