短語(yǔ)詞組短語(yǔ)wide strip skip -mining 寬條帶跳採(cǎi)strip -partial mining 條帶開(kāi)採(cǎi)strip extraction coal -pillar mining 條採(cǎi)煤柱廻收down -dip strip mining 頫斜式開(kāi)採(cǎi) 返回 strip-mining