have an affair的用法和样例：
例句
- There's a rumour going round that Sue and David are having an affair.
有谣传称休和戴维关系暧昧。 - They were having an affair under my very nose, and I didn't even realize!
他们就在我眼皮底下勾搭上了，而我竟没看出来！ - They had an affair once, but that's ancient history now.
他们曾经有过一段暧昧关系，但现在那已成为遥远的过去了。 - Did you know he was having an affair?
你知道他有外遇了吗？？
