| |||
file security | |||
classified document | |||
secret file | |||
classified documents; secret documents |
保密文件: 14 phrases in 10 subjects |
Aviation | 2 |
Business | 1 |
Commerce | 1 |
Economy | 3 |
Electronics | 2 |
General | 1 |
Metallurgy | 1 |
Project management | 1 |
Shipbuilding | 1 |
Space | 1 |