求翻译：但是变换后的序列限制了所讨论经济问题的范围，并且有时变换后的序列由于不具有直接的经济意义，使得化为平稳序列后所建立的时间序列模型不便于解释。。是什么意思？

But the transformation sequence limit the scope of the discussion of economic issues, and sometimes transformed into stationary series after the establishment of the sequence does not have a direct economic significance, such time series model is not easy to explain. .

But after the transformation sequence is limited by the scope of the discussion of economic issues, and in some cases transform the sequence after the does not have a direct economic importance for the smooth, so that the serial the time series model is not easy to explain. .

But transformed after the sequence to limit discussed the economic problem the scope, and sometimes transformed after the sequence because did not have the direct economical significance, after caused to change into the time series model which the steady sequence established not to be advantageous f

But the transformed sequence limits the scope to discuss economic issues, and sometimes the transformed sequence because it does not have a direct economic importance, made into a stationary series by establishing a time series model is not easy to explain ...

正在翻译，请等待...