Oilproduction is falling by up to 10% a year, and proven reserves are now equal to just 13 years of current output.
产油量每年以减少10%以上，探明储量只有现今年产量的13%。
2
Experts believe that these areas could eventually produce nearly 10 years' worth of America's current annual oilproduction.
专家们相信，以美国当前的年度石油产量，这些区域最终能够生产接近10年。
3
Future oil and gas price increases may extend the productive lives of crude oil and natural gas reservoirs beyond the current terms of the relevant production licenses.