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极环
tech. polar ring
极环
: 153 phrases in 33 subjects
Agriculture2
Air defense3
Architecture1
Automobiles4
Aviation4
Business1
Chemistry4
China1
Desert science4
Earth sciences16
Ecology4
Electric machinery1
Electronics15
Engineering geology1
General3
Geophysics1
Hydroelectric power stations1
Information technology1
Latin1
Life sciences1
Metallurgy13
Oil / petroleum8
Plastics1
Polymers1
Power system protection1
Rail transport1
Shipbuilding2
Space14
Technology30
Telecommunications1
United Nations8
Water resources1
Wind Energy3

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