单词	clear-air turbulence
释义	clear-air turbulence noun ˈklir-ˈer-  : sudden severe turbulence occurring in cloudless regions that causes violent jarring or buffeting of aircraft Example Sentences Recent Examples on the Web Williams' analysis predicts that clear-air turbulence will increase significantly around the globe by the period 2050-2080, in particular along the busiest flight routes, and the strongest type of turbulence will increase the most. Jacopo Prisco, CNN, 1 Sep. 2022 Turbulence can be unexpected, particularly clear-air turbulence. John Cox, USA TODAY, 6 Nov. 2020 The main consequence for aviation is an increase in clear-air turbulence, or in-flight bumpiness at high altitudes in regions devoid of significant cloudiness or nearby thunderstorms, as the jet stream becomes more unstable. New York Times, 22 Aug. 2019 Word History First Known Use 1955, in the meaning defined above
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