used to say that someone or something is not the kind of person or thing being described
根本不是的,远非的(用于表示与描述的情况不符)
He's no expert [=he's not an expert] in American history.
他根本不是美国历史专家。
She's no fool.
她可不是傻子。
This is no simple matter. [=this is not a simple matter]
这个问题可不简单。