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安 全架 : 30 phrases in 15 subjects |
| Architecture | 1 |
| Automobiles | 4 |
| Aviation | 2 |
| Biotechnology | 1 |
| Business | 1 |
| China | 1 |
| Computer networks | 1 |
| Cryptography | 2 |
| Drilling | 1 |
| Electronics | 1 |
| Librarianship | 1 |
| Oil / petroleum | 6 |
| Space | 1 |
| Technology | 6 |
| United Nations | 1 |
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