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。
Exploration and development of coal-bed methane in China has its particularity for its geological conditions of coal-forming process and coalification are different from the US.
我国煤层气在成煤和煤化作用地质条件与美国有差异，勘探开发有一定特殊性。
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