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(单词翻译)
Jet streams, usually located about 30,000 to 35,000 feet up, can bowl along at up to 180 miles an hour and vastly influence weather systems over whole continents, yet their existence wasn't suspected until pilots began to fly into them during the Second World War. Even now a great deal of atmospheric1 phenomena2 is barely understood. A form of wave motion popularly known as clear-air turbulence3 occasionally enlivens airplane flights. About twenty such incidents a year are serious enough to need reporting. They are not associated with cloud structures or anything else that can be detected visually or by radar4. They are just pockets of startling turbulence in the middle of tranquil5 skies. In a typical incident, a plane en route from Singapore to Sydney was flying over central Australia in calm conditions when it suddenly fell three hundred feet—enough to fling unsecured people against the ceiling. Twelve people were injured, one seriously. No one knows what causes such disruptive cells of air.
1 atmospheric | |
adj.大气的,空气的;大气层的;大气所引起的 | |
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2 phenomena | |
n.现象 | |
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3 turbulence | |
n.喧嚣,狂暴,骚乱,湍流 | |
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4 radar | |
n.雷达,无线电探测器 | |
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5 tranquil | |
adj. 安静的, 宁静的, 稳定的, 不变的 | |
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