When someone says “fair enough”, they say in order to show that they understand why others have said or done something. “fair enough”在口语中很为常见，当对方给的理由已经充分了，你觉得合理表示赞同的时候，就可以来上这么一句：Fair enough.

Examples:

- I don’t feel like going out tonight. I’ve got a bit of a headache. 我今晚不想出去。我有一点头疼。

- Fair enough. 明白了，没问题。

- Excuse me, but this is the seat the guest booked yesterday. 不好意思，但这个位子是这位客人昨天预订的。

- Fair enough. 好吧。