This shift is due to both improved safety standards and technology as well a move away from underground mines towards surface mining and controversial mountaintop-removal mining.
这种数据上的提高在于安全标准的提升和技术的进步，同时，地表开采和富有争议性的削山开采也使得地下开采也逐渐走到地上。
The surface subsidence of coal cities is created by the coal mining underground, it is necessary to make the territorial planning of coal cities, which based on the geological conditions.
煤层的地下开采造成煤矿城市的地面沉陷，应搞好以地质状况为基础的煤矿城市的国土规划。
The mining minister in Chile says all is going well in the efforts to bring to the surface 33 miners who have been trapped deep underground for more than two months.
智利矿务部长表示，拯救33名被困矿工的工作进展顺利。这33名矿工已经在地面以下深处被困了超过两个月的时间。
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