Years of exploitation of the old mines, the ground magnetic survey of the shallow and surface disturbance is very serious, coupled with magnetic response of deep ore bodies on the ground are weak, hard to be identified.
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The multielement of form of legal liability make it hard to be identified.
法律责任形式的多元化必然使得对其认定更为复杂。
In practice, this could be hard to achieve, but he has identified one principle. Central Banks' credibility should be focused where it is most needed, on controlling inflation.
实际上，这可能很难做到，但是他指明了一个原则：中央银行的信用要最需要的时候才能用，而不是在控制通货膨胀的时候用。
The accuracy of identified results of alcohol quality by panel is hard to be guaranteed, so it is necessary to develop a rapid and accurate method for its identification.
通过感官鉴别酒类质量结果的准确性难以保证，因此研究快速、准确的鉴别方法是必要的。
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