不明是非: confuse right and wrong; not know chalk from cheese 短语和例子小孩子不明是非是很正常的。 a small child's confusion in distinguishing the right from the wrong is quite natural
是非不明: be unable to tell right from wrong; have no sense of right or wrong; not to know right from wrong; right and wrong remain confused.; there is no clarification of [as to] what is right and
辨别是非: distinguish [differentiate; discriminate] between right and wrong
