It is difficult to separate legend from truth.
传说与事实很难分辨。
It's so difficult to separate it.
但是要区分是非常困难的。
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。
It is difficult to separate the initial sink products.
最初的水槽产品很难分离开来。
First, it is sometimes difficult to separate the policy and scientific issues.
首先，有时很难区分政策和法律问题。
Many mixture which are difficult to separate by other methods can be separated by chromatography.
许多用其他方法很难处理的混合物可以利用色谱法进行很好的分离。
The solution is not to separate teaching and research, but to recognize that the combination is difficult.
这种解决方案不是要将教学与研究分离开来，而是承认它们的结合是困难的。
The solution is not to separate teaching and research, but to recognize that the combination is difficult.
这种解决方案不是要将教学与研究分离开来，而是承认它们的结合是困难的。
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