The selection of mining methods is a complex process and there is no satisfactory mathematic model to describe it yet.
采矿方法的选择是一个复杂过程，目前尚无满意的数学模型予以描述。
The selection of mining methods is a complex process and there is no satisfactory mathematic model to describe it yet.
采矿方法的选择是一个复杂过程，目前尚无满意的数学模型予以描述。
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