... The Very Difficult 上山很艰难 Very Difficult To Distinguish 很难分清 very difficult to understand 难解的 ...
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It is often very difficult to distinguish between the two.
这两者时常很难去区分。
It has, until recently, been very difficult to distinguish between the two.
直到最近以前，要区别开这两者是非常困难的。
Therefore, it is very difficult to distinguish oil with water layer and to evaluate oil layer by using logging data.
采用人工神经网络测井识别技术识别油层并进行储层物性及含油性的解释。
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