quite good, bad, etc. in comparison with other similar things or with what you expect

He's a relatively good squash player. 他是个比较不错的壁球运动员。

There was relatively little violence. 暴力事件相对较少。

said when you are judging one thing in comparison with other things

Relatively speaking, it's a fairly poor country. 相对而言，这是个很贫穷的国家。