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to phrases
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
cleaning air: 106 phrases in 23 subjects
Agriculture2
Architecture1
Automobiles12
Aviation2
Business3
Compressors1
Drilling1
Earth sciences2
Ecology2
Economy2
Electric machinery1
Electronics8
Environment4
General3
Hydroelectric power stations1
International trade1
Metallurgy6
Oil / petroleum2
Oil processing plants2
Refrigeration9
Space1
Technology36
Wind Energy4

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