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主保护
el. basic protection
hydroel.st. main protection; primary protection
主保护: 69 phrases in 24 subjects
Automobiles1
Business2
China2
Commerce3
Desert science1
Earth sciences1
Ecology2
Economy9
Electronics2
Environment1
Finances15
General1
Hydroelectric power stations5
Information technology1
International trade6
Life sciences1
Marketing1
Metallurgy1
Oil / petroleum1
Project management1
Rail transport2
Technology8
Telecommunications1
United Nations1