caving methodcaving system崩落: talus ruoble; scree; collaps ...开采法: extraction system房式崩落开采法: panel working with caving-system房柱式崩落开采法: room-and-pillar caving分段崩落开采法: sublevel caving method; sublevel caving system下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:崩落开采法，即可在微信中查询翻译
