There's ___ enough food in the world for everyone 填no还是not?为什么

There's ___ enough food in the world for everyone 填no还是not?为什么

not
no 后一般直接接名词
如：
There is no food .

There's _not__ enough food in the world for everyone

not enough 是固定搭配 表示不够

not enough
不是 no enough