It is difficult to separate legend from truth.

传说与事实很难分辨。

《柯林斯英汉双解大词典》

Indeed, pain and itch have been difficult to separate.

实际上，疼痛和瘙痒一直以来都很难分开。

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Everyone hopes to be successful, but the success and failure as easily, it is difficult to separate.

人人都希望自己能成功，但成功与失败如影随形，是很难分开的。

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It must also be difficult to separate the disease burden of obesity from the figures.

BBC: Sedentary lifestyle can kill

It is difficult to separate sour feeling from sober analysis in Mr Besson's partial text.

ECONOMIST: France's next president

But now it has become more and more difficult to separate myself from the daily news stream.

FORBES: False White House Scare Thanks To Hacked AP Twitter Account Feed