fair play
公正无私
A:My two children often fight with each other. I've criticized them, but they never listen to me.
A:我的两个孩子经常打架，我批评他们，他们也不听。
B:Don't criticize them to much. Sometimes you can leave them alone to settle the problem. You are only there to see fair play.
B:别批评得太多，有的时候你可以让他们自己处理这些问题，你只要在一旁看看是否公平。
A:Is it all right to be just like this?
A:这样能行吗?
B:Of course.
B：当然行。