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a unit
gen. unit 开头是辅音音素[j]一个单位
A unit: 77 phrases in 24 subjects
American usage, not spelling1
Automobiles1
Aviation2
Bridge construction1
Business3
Chemistry2
China2
Commerce4
Company name1
Desert science1
Economy19
Electric machinery1
Electronics7
Exhibitions1
Explosives and Explosive Ordnance Disposal1
General8
Metrology3
Name of organization1
Nautical6
Oil / petroleum1
Project management2
Space1
Technology5
United Nations3