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to phrases
system activity
IT
系统活动
system activity
:
38 phrases
in 17 subjects
Agriculture
1
Air defense
3
Aviation
6
Chemistry
1
Drilling
1
Earth sciences
1
Economy
1
Electronics
9
Information technology
2
Mechanics
1
Name of organization
2
Nautical
1
Oil / petroleum
2
Space
3
Technology
1
United Nations
2
United States
1
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