- commercial seam
- 商业: commerce; trade; business
- 煤层: coal rake; coal seam; coal b ...
- 煤层: [地质学] coal rake; coal seam; coal bed 薄煤层 thin seam; 厚煤层 thick seam
- 工业煤气: industrial gas
- 薄煤层: black ring; girdle; low coal seam; low-coal deposit; thin coal; thin seam
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