he knows right from wrong.中的"right from wrong"

问题描述:

he knows right from wrong.中的"right from wrong"
he knows right from wrong.中的"right from wrong"是什么意思,为什么可以这么用

know right from wrong 分辨是非
即等于从错中分辨得出哪些是对的
介词from
prep.(表示时间)从…; (表示原因)因为; (表示来源)来自…; (表示分离)与…分离[隔开];