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clear air turbulence
gen.	晴天大气乱流
avia.	晴空涡流; 晴空素流
desert.	晴天乱流
meteorol.	晴空揣流
space	晴空紊流［湍流］; 晴天湍流
wind.	晴空湍流
clear-air turbulence ['klɪə 'ɛə 'tə:bjuləns]
tech.	晴空湍流
English thesaurus
clear air turbulence
avia., Canada	Turbulence encountered in air where no clouds are present. This expression is commonly applied to high- level turbulence associated with wind shear WS. CAT is often encountered in the vicinity of the jet stream.

Clear - Air Turbulence: 8 phrases in 4 subjects

Aviation	4
Earth sciences	1
General	1
Space	2