这英语句语法对么?我想表达的是我们没法划分哪些研究重要哪些不重要.we cannot draw an explicit

我想表达的是我们没法划分哪些研究重要哪些不重要.we cannot draw an explicit line between the researches which are important and which not.
We can't distinguish what research is important from what research is not important
We can't tell the differences between what is important research and what is insignificant research
We can't set up an accuratel definition about the important and insignificiant studies
We are unable to accurately discriminate which studies are important and which studies are insignificant