Shangqiu-Zhecheng coal fields 商柘煤田
Surface coal fields classifying 露天煤田分类
Huainan and Huaibei coal-fields 两淮煤田
Main coal fields 主要煤田
surface coal fields 露天煤田
The conclusions are also suitable for other similar coal fields.
文中所得结论同样适合于其它类似矿区。
China's energy demands are starting to outstrip its efforts to develop of its vast domestic coal fields.
虽然中国坐拥庞大的煤炭资源，但煤矿的开发速度已开始跟不上能源需求增长的步伐。
The state governor freed her, but only after the United States Senate ordered an investigation into conditions in the West Virginia coal fields.
但在美国参议院下令就西维吉尼亚煤矿进行调查后，该州州长赦免了她。
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