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secrecy system | |||
primary system | |||
privacy system; protected system |
保密 系统: 43 phrases in 10 subjects |
Air defense | 8 |
Automobiles | 3 |
Aviation | 4 |
Computer networks | 2 |
Cryptography | 1 |
Electronics | 7 |
Information technology | 1 |
Space | 13 |
Technology | 3 |
Telecommunications | 1 |