Aimed at the reality of local mines, this paper inquired into the improving coal mining to get the results of increase in coal qualities and decrease in cost.

针对地方煤矿的实际情况，在采煤方法上进行探索，达到提高煤质，降低成本的目的。

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That would provide a massive hundred-fold decrease in the cost of space flight.

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They argue that a further decrease in the cost of capital will not spur the desired increase in demand that the economy so badly needs.

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For those who call such supply-demand projections folly, one need only look at the 50 percent decrease in the cost of natural gas brought about by a 20 percent increase in supply.

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