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- 问题详情：Whydohumanbeingsstillrisktheirlivesundergroundanddoingoneofthedirtiestandmostdangerousjobsintheworld?Itisanincreasinglyurgentquestion,giventherecentminingaccidentsinSago,W.VaandHuntington,Utah.Asmallgroupofengineersandroboticsexpertslookforwa...
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