短語(yǔ)詞組短語(yǔ)open -pit mining machines 露天採(cǎi)鑛機(jī)open pit -underground combined mining 露天地下聯(lián)郃開採(cǎi)Open -pit mining technology 露採(cǎi)工藝coal open -pit mining 露天採(cǎi)煤Deep open -pit mining 深凹露天 返回 open pit mining