先把矿体上的覆盖层剥离掉,暴露矿层,然后在露天下用电铲等机械采掘,不需要凿井 [ opencut;opencast ] 矿床接近地面、可供露天开采的矿 [ a deafening sound of beating the gongs and drums great din of gongs and drums ] 锣声鼓声直上九霄。
基于6个网页-相关网页
先把矿体上的覆盖层剥离掉,暴露矿层,然后在露天下用电铲等机械采掘,不需要凿井 [ opencut;opencast ] 矿床接近地面、可供露天开采的矿 [ a deafening sound of beating the gongs and drums great din of gongs and drums ] 锣声鼓声直上九霄。
基于6个网页-相关网页
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