见例句：
What he told us was more of an illusion than a reality.
more of在这里意为“更大程度上；更多地是… ”,后面一般跟than...,也可以省略than的部分.
但more of也可以表示一个群体里的更多的一部分,如More of my students want to do their homeworks by themselves.
还有一首我喜爱的诗,里面more of的含义你可以仔细品味一下,文学中的用法.
you do not altogether know me,dear
there is more of me than there was-- with this,
i can love more of you--more of what makes
you your own self--Truly!if you were less
lovable--less charming--ugly even--
i should love you still.
