Supervisors in this unit group supervise and co-ordinate the activities of workers engaged in drilling for oil or gas, operating service rigs, or providing oil and gas well services.
本单元组监督元监督和协调从事钻探石油或天然气，运营服务的钻机，或提供石油和天然气井技术服务的工人的活动。
Supervisors in this unit group supervise and co-ordinate the activities of workers engaged in drilling for oil or gas, operating service rigs, or providing oil and gas well services.
石油和天然气钻探和服务主管主管负责监督和协调从事石油或天然气钻探工作人员的相关工作，经营服务平台，或提供石油和天然气方面的服务。
But only 70 oil - and gas-service workers died in 2009 (down from 120 in 2008), and the number of RIGS operating in the U.S. also fell sharply last year.
但是，2009年石气服务工人死亡人数从2008年的120人降到了70人，在美国工作的钻井平台数量也急剧下降。
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