mining coal是什么意思_(采动煤体的英文)

开采煤炭

采动煤体

煤体注水,water-affusing into... ... ) water-affusing into coal 煤体注水 ) mining coal 采动煤体 ...

采煤

采煤破坏,Surface... ... ) mining 采煤 ) mining coal 采煤 ) mining method 采煤方法 ...

mining coal