小煤矿
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the small colliery 小型煤矿
medium and small colliery 中小煤矿
coal mining in small colliery 小煤矿开采
small-sized colliery 小煤矿
ground position of small-sized colliery 小窑巷道地面位置
At the small Bandingliang colliery, the pit has been dug so far into the hillside that truck drivers take 30 minutes to reach the coalface, fill up and return with their load.
在板定梁煤矿，矿井已被挖进山体深处，卡车司机开了30分钟才到达采煤工作面，装上煤之后满载而归。
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