The ground is cold and moist, with the chill factor amplified by ventilation fans used to blow fresh air into the mine, and the sprinkler that keep the coal dust down.

因为有通风设备往里面输送新鲜空气，还有洒水器不断地给煤浇水以降温，所以地下既阴冷又潮湿。

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Obviously, the main effect factor on activated carbon pore structure is the raw material coal property.

分析结果表明，原料煤的性质是影响活性炭孔隙结构的主要因素。

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It was indicated in the paper that the structural setting of the basin sedimentary basement is a major factor controlling coal quality and coal accumulation of Late Triassic in Fujian.

本文研究结果表明：盆地沉积基底的构造条件是控制福建晚三叠世聚煤作用和煤质变化的主要因素。

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While other factors, including a sluggish U.S. economy and increasing energy efficiency, have contributed to the decline in carbon emissions from factories, automobiles and power plants, many experts believe the switch from coal to natural gas for electricity generation has been the biggest factor.

WSJ: Rise in U.S. Gas Production Fuels Unexpected Plunge in Emissions

High installation costs have been the biggest inhibiting factor to the adoption of solar energy in the past, with traditional energy sources like coal and oil being a more cost effective solution.

FORBES: First Solar Stock Flies Too High For Firm's Value

The primary factor in the decline in stock price for the two firms was the weak demand for coal freight services, a trend which will affect CSX in Q4 2012 and will likely to do so over the next few quarters.

FORBES: CSX Earnings Preview: Modest Growth Expected