The food was not actually all that expensive.这个句子中 “all that"是什么用法?

问题描述:

The food was not actually all that expensive.这个句子中 “all that"是什么用法?

我觉得.嗯.应该这样理解
the food was not actually all.这里是一部分,然后后边that expensive是一部分
那个that翻译成“那么”的意思
所以整句话是:
实际上食物并非全部的都那么贵