- main haulage road
- 主要: main; chief; principal; majo ...
- 运输: transport; carriage; conveya ...
- 平巷: drift; level; heading; stulm ...
- 主要运输平硐: main haulage tunnel
- 运输平巷: gate road; going headway; haulage drift; haulage entry; haulage heading; haulage roadway; haulage tunnel; haulageway; hauling gallery; hauling road; transport drift
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