1.However, we acknowledge that there are considerable discussions among researchers as to __

然而，我们承认研究人员对__进行了相当多的讨论。

2.We speculate that this might be due to __

我们推测这可能是由于__

3.There are reasons to doubt this explanation of __

有理由怀疑对__的解释。

4.It remains unclear to which degree __ are attributed to __

目前尚不清楚__在何种程度上属于__

5.However, __ does seem to improve __

然而，__似乎确实改善了__

6.This does seem to depend on __

这似乎确实取决于__