Producers have boosted supplies and recoverable reserves in the United States by combining horizontal drilling with hydraulic fracturing, also called fracking, to produce gas from shale formations.
2
中国企业对页岩气的兴趣也很强烈，国企将宝押在有名望的生产商上，尽量多的买进美国的专业开采技术。
Chinese interest in shale gas is strong, with state companies buying up American expertise as they take stakes in established shale-gas producers.
3
联邦监管迫使美国能源企业不得不采用技术降低页岩气开采对环境的影响。
With federal regulation looming, US energy firms are rolling out technologies to reduce the environmental impact of shale-gas drilling.
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