For this reason, the well designer generally seeks to maximize the fluid velocity (or other measure of jet energy) to achieve maximum cleaning at the bottom of the hole.

正因为这一原因，井眼设计人员一般寻求使流体速度(或其它射流能量)最大化的方法去达到最大程度地清洁井底的目的。

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Astronomers think Swift has a dead-on view of the digestive system of a black hole, which is blasting out a jet of energy as it RIPS apart a star trapped in its gravitational fist.

天文学家认为，雨燕观测到的是黑洞吞噬其它恒星的场景，即黑洞在将恒星撕碎并拖进它的重力陷阱的瞬间释放出的能量。

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"You're putting energy into the moon's orbit and taking it out of the Earth's spin," says James Williams, a senior research scientist at NASA's Jet Propulsion Laboratory in Pasadena, Calif.

资深科学家詹姆斯·威廉姆斯说：“这样的情况就相当于在月球沿着其轨道运行的时候对它施加能量，使其摆脱对地球的公转。”他就职于加利福尼亚州帕萨迪纳市的美国国家航空航天局喷气推进实验室。

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Jet engines and energy infrastructure did not flex their muscles this quarter, but both make sense from a long-term perspective.

FORBES: Planes, Trains, Pipes And Loans: GE's Diversified Portfolio Delivers

At a time when the world generally is cutting budgets, General Electric Co. ( GE) recently announced that sales of its huge-ticket items like jet engines, gas turbines, energy infrastructure and locomotives are really doing very well.

FORBES: Connect

She lived during the birth of airplanes, skyscrapers, suspension bridges, radio and television, antibiotics, atomic bombs and energy, interstate highways, jet travel and a moon landing.

FORBES: Is Technological Progress Slowing Down?