Why do human beings still risk their lives under ground and doing one of the dirtiest and most dangerous jobs in the world? It’s an increasingly urgent question,given the recent high-profile(引人注目的)mining accidents in Sago, W. Va., and Huntington, Utah. A small group of engineers and robotics experts envision(展望)a day in the not-too-distant future when robots and other technology do most of the dangerous mining work..
