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clean air ['kli:n 'ɛə]
avia. 洁净空气
ecol. 清洁空气
tech. 纯洁空气
wind. 洁净大气
 English thesaurus
Clean Air ['kli:n 'ɛə]
USA CA
Clean Air: 49 phrases in 17 subjects
Automobiles11
Aviation1
Business2
Earth sciences2
Ecology2
Economy2
Electronics4
Environment6
General1
International trade1
Metallurgy1
Oil / petroleum1
Oil processing plants2
Refrigeration2
Space1
Technology7
Wind Energy3

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