Engineers had spent days pumping heavy drilling fluid into the leaking well head on the ocean floor in a high-pressure bid to smother the gushing crude and ultimately seal the well with cement.

工程师们数日来一直向海底的泄漏油井泵入大量的钻探泥浆，希望用高压堵住喷涌的原油，最后用水泥封死油井。

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Fracking involves pumping water, chemicals and sand underground at high pressure in order to release gas.

液压破碎法是利用高压将水、化学物质和沙打到地下以获取天然气的方法。

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In those 10 seconds, your brain isn't getting oxygen and your blood isn't pumping to your heart. This can cause high blood pressure, fatigue and a decrease in productivity.

在这10秒钟的时间里，大脑缺氧，血液也停止进入心脏，结果引起高血压，疲惫和性能力下降。

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Fracking is a technique involving pumping water and chemicals into shale rock at high pressure to extract gas.

BBC: Lancashire's shale gas estimated at ?136bn by Cuadrilla

Fracking is a controversial process that involves pumping water and chemicals into shale rock at high pressure to extract gas.

BBC: Cuadrilla bids to resume Westby and Banks fracking

Fracking is a technique of shale gas extraction that involves pumping water and chemicals into shale rock at high pressure to extract gas.

BBC: Lancashire shale gas 'could be worth billions'