It is difficult to separate legend from truth.
传说与事实很难分辨。
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。
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。
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。
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