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中继系统
space
relay system
telecom.
link system
中继 系 统
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110 phrases
in 18 subjects
Agriculture
2
Air defense
9
Aviation
11
Cartography
1
Communications
3
Computer networks
2
Construction
1
Earth sciences
5
Electric machinery
1
Electronics
25
General
2
Geophysics
1
Information technology
3
Space
19
Technology
16
Telecommunications
4
United Nations
1
United States
4
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