1. no more than 表示仅仅、只有(= only)，强调少；而 not more than 表示不多于、至多(= at most)。如：

He is no more than an ordinary English teacher. 他只不过是个普通的英文老师。

He has no more than three children. 他只有 3 个孩子。

He has not more than three children. 他最多 3 个孩子(有或许还不到 3 个之意)。

2. 用于比较两件事物时，no more ... than 表示对两者都否定，意为同……一样不(＝neither ... nor)；而 not more ... than 指两者虽都具有某种特征，但程度不同，意为不如、不及(= not so ... as)。如：

He is no more a writer than a painter. 他不是画家，也不是作家(= He is neither a painter nor a writer)。

A whale is no more a fish than a horse is. 马不是鱼，鲸也不是鱼(=Neither a horse nor a whale is a fish)。

She is not more clever than he is. 她不如他聪明(= She is not so clever as he is)。

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