They're offering us a 50% discount plus free delivery.

他们可以给我们半价，另外免运费。

No way.What's the catch?

不可能。他们有什么附加条件吗?

Why don't you come by and catch up with some peers?

你何不过来和同僚们叙叙旧?

You always have a motive.What's the catch?

你做事总是有目的的。有什么附加条件?

重点讲解

What are the hidden condition?

What's the catch?

天下没有免费的午餐，得到了利益，势必会相应付出，这时就可以问对方: What's the catch?意指“有什么附加条件?”catch在这里作名词，指“隐情”。也可以在商务口语中指附加条款，如:There's a catch in their deal（他们的交易里有个附加条款。）