这本质上是一本词典，但它有一个独特的功能。

This is ___essentially a dictionary, but it has a unique feature.

他所说的基本上是正确的。

What he's saying is ___essentially true.

他的新理论本质上是对的，尽管有些细节还需要完善。

His new theory is ___essentially correct, though some details need work.