retreat mining 中文意思是什麼
retreat mining
解釋
後退式采礦-
Robert murray, the mine ' s owner, says that “ retreat mining ” was not being used in crandall canyon
礦主羅伯特默里說克蘭德爾峽谷煤礦並沒有採用這種「撤退式采礦」方法。 -
The coal was being mined by a method called “ retreat mining ”
這個煤礦的開采方式被稱為「撤退式開采」 。 -
Records show, however, that the mining plan recommended by an engineering firm and approved in april by the federal govern - ment, was for “ retreat mining
然而拒資料顯示，一個工程公司向他們推薦的采礦計劃，並且在四月份得到聯邦政府批準的就是「撤退式采礦」方法。
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