UCG is promoted as a relatively clean method of exploiting coal seams that are too deep or thin to be tapped economically using conventional mining.
相对于传统的采矿技术来说，煤炭地下气化技术在开采过深或过浅煤层时更为适用，这种技术不仅开采成本较低，而且开采过程较为清洁。
At the moment, this process costs more than ten times as much as conventional mining, but some countries might regard that as a small price to pay for security of supply.
目前来说，这个工艺的成本要十倍于传统的开采铀矿，不过一些国家可能会把它看作是为供应安全而付出的小小代价。
This paper introduces the concepts of original association rules and proves all rules in the rules set mined by conventional mining algorithms can be generated by the original association rules.
该文介绍了原关联规则的概念，证明了传统算法挖掘出的关联规则集中的任何规则，均可以由原关联规则导出，而原关联规则的数目远远小于传统算法挖掘出的关联规则数目。
This paper introduces the concepts of original association rules and proves all rules in the rules set mined by conventional mining algorithms can be generated by the original association rules.
该文介绍了原关联规则的概念，证明了传统算法挖掘出的关联规则集中的任何规则，均可以由原关联规则导出，而原关联规则的数目远远小于传统算法挖掘出的关联规则数目。
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