1. These men work underground for 6 hours at a time , mining for coal.
    这些人在地下工作一次挖煤6小时。

2. Heavy metals from coal mining have contaminated much of the area’s waters.
    开挖煤矿时逸出的重金属已经污染了这个地区的许多水域。

3. My particular experience is largely in oil, and the search for oil has done more to improve deep drilling than any other mining activity.
    我是专门搞石油的，寻找石油比其他任何采矿业对改进钻探作的贡献都要大。

4. One day in 1923, young lab worker Richard Drew from the Minnesota Mining and Manufacturing (制造) Company heard workers in an automobile body shop complaining.
    1923年的一天，明尼苏达州采矿与制造公司年轻的实验室技术员理查德·德鲁听说一家汽车车身制造厂的工人们遇到了个难题。