There are no exact federal rules for direct potable reuse.

对于重复使用直接饮用水没有确切的联邦规定。

Now if you aren't sure of the exact phrasing or grammar rule, investigate!

如果你不确定确切的措辞或者是语法规则的话，那就去查吧！

There really isn't an exact rule when we would say " several" versus " many."

当我们说“几个” 还是“很多” 时，确实没有确切的规则。

So the differences depend on the context; it's hard to give an exact rule for every case however.

所以差异取决于上下文；然而， 很难为每种情况都给出一个确切的规则。

Different people own the specific restaurant, but they have to follow the exact rules that McDonald's has if you want to own one of their restaurants.

不同的人拥有特定的餐厅，但如果您想拥有他们的一家餐厅， 他们必须遵守麦当劳的确切规则。