“underground coal mining district”的概念、定义、翻译、参考文献-科学参考

单词	underground coal mining district
释义	underground coal mining district 井下采煤区井下采煤区
随便看	formicivorous Formicoidea formidable-looking code formidable natural conditions formiminoglutamic acid formin forming forming angle forming attachment forming between profile forming block forming by turning forming conveyer forming cutter forming defect forming die forming dresser forming electrode forming fare forming gas forming head forming lapping forming lathe forming limit forming limit diagram

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