开采暴露的煤表面；正在开采的煤层的一部分
开采暴露的煤表面；正在开采的煤层的一部分；煤矿中巷道、入口或采场的端部
开采暴露的煤表面；正在开采的煤层的一部分
The surface of coal exposed by mining, or a part of a coal seam that is currently being mined.
煤矿中巷道、入口或采场的端部
The end of a drift, entry, or room in a coal mine.
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