That separates the men from the boys.

这就是男人和男孩的区别。

Something to separate the men from the boys, the wheat from the chaff, the mesons from the pi-mesons, the quarks from the quacks.

来看看你们是男人，还是男孩，是粮食，还是糟糠，是介子还是 π 介子，真夸克（基本粒子之一）还是庸医。