The mathematical model of complex coal seam is established by mathematical statistics method.

利用数理统计的方法建立复杂煤层的数学模型。

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Owing to complex coal-forming process, the trace elements in coal present unique accumulation and scatter laws.

由于复杂的成煤过程，煤炭中微量元素呈现独特的集散规律。

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However, the resource-bearing regions distribute uneven. The conditions of complex coal mining technology and biological environments limit the coal resource development of energy bases.

但是，我国煤炭资源地域分布不均衡，复杂的煤矿开采技术条件和生态环境制约着我国能源基地煤炭资源的开发。

youdao

This is very complex and untested technology compared, say, to coal- and gas-fired or nuclear power plants.

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