1. A worker employed inside a pit in various industrial operations, as in a coal mine. 
   矿工被雇在不同工业作业区的矿井内工作的人，如煤矿工人
2. It's a bleak look-out for the coal industry as the number of pit closures increases. 
   煤井关闭的数目日多，煤炭工业前景暗淡。
3. It's a bleak look out for the coal industry as the number of pit closures increases. 
   煤井关闭的数目日多,煤炭工业前景暗淡.
4. groundwater flow into foundation pit 
   基坑涌水
5. ventilation for deep open pit 
   深凹露天矿通风

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• 1. 煤矿，煤窑
  coal pillar thrust || 煤柱压碎...coal pit || 煤矿，煤窑...coal plant || 煤中所含的树木化石
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