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air cover ['ɛə 'kʌvə]
cultur.	空中掩护
tech.	航测成图地区
air-cover ['eə'kʌvə]
gen.	空中掩护
English thesaurus
air cover ['ɛə 'kʌvə]
mil., logist.	One of the main missions of fighter aviation. Its purposes are to prevent air attacks on friendly land and naval forces and on rear area installations, to prevent enemy air reconnaissance, and also to protect other friendly air units. Air cover is provided by robust and determined fighter action aimed at destroying enemy aircraft in the air and is carried out in cooperation with an antiaircraft grouping of air defense forces. (UKR/NATO)

air- cover: 13 phrases in 7 subjects

Automobiles	2
Electric machinery	1
Electronics	2
Hydroelectric power stations	2
Shipbuilding	1
Space	1
Technology	4