I found a small coal black bird in the grass.

我在草丛中发现了一只黑色的小鸟。

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The application of simple hydraulic prop in the face of small coal mine is expounded.

阐述了单体液压支柱在小型煤矿工作面支护中的应用。

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This paper introduced methods to select tunnel position and maintain measures for the tunnel in small coal pillar.

文章介绍了在煤柱中确定巷道位置的方法及巷道的维修措施。

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American Electric Power, for instance, focuses more on coal, while Exelon plans on closing two of its small coal plants, Rowe notes.

FORBES

If that's the case it could save the dozens of small coal plants that now look sure to close as clean air rules tighten over the next several years.

FORBES: Page 2 of 2

Hirs et al conclude utilities are most likely to scrap small coal plants representing about 60GW and another 72GW of plants that are more than 40 years old and thus fully depreciated.

FORBES: Frack Gas Not Likely To Displace King Coal, Study Suggests