Chelating
[机] 螫合剂
🗣️ 情景例句
Do we have to pre-book tours, or can we get them on site?
我们必须预定行程， 还是到那个地方再说？
Have you somewhat to do tomorrow,do it today.
明天如有事，今天就去做。
Oh? What happened?
哦？发生什么事了？