coal mining
短語詞組
- coal -mining methods 採煤方法
- coal surface mining 露天採煤
- single coal seam mining 單一煤層開採
- coal resources mining 煤炭資源開採
- coal pillar mining 帶煤柱開採
- coal mine mining 鑛井開採
- coal caving mining 煤採煤;放頂煤開採;放頂煤
- opencast coal -mining 露天採煤 返回 coal mining
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