It's selling well.

卖得很好啊！

We really need that material, you know.

你知道，我们急着需要那批材料。

We can't sign the contract yet.

我们还不能在契约上签字。

Is there any chance that we can substitute this for you?

这个可不可能使用代替品呢？

Just whose fault is this damage?

这次的损坏究竟是谁的责任呢？

Yes, it is.

是啊。