She doesn't understand the difference between right and wrong.

她不能明辨是非。

《牛津词典》

Children must be taught the difference between right and wrong.

必须教儿童分清是非。

《牛津词典》

At what age are children able to distinguish between right and wrong?

儿童到什么年龄才能明辨是非？

《牛津词典》

It is the eternal struggle between right and wrong."

VOA: special.2009.06.11

They will see that even the very young know the difference between right and wrong.

CNN: Our 'outrageous dream': Bringing diversity to science

It is a fight between right and wrong, in which relativism should have no place.

CNN: McCain's August 6, 2007, speech addressing private property rights

And we need a criminal justice system that scores a clear and heavy line between right and wrong.

BBC: Riots: David Cameron's Commons statement in full