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| safety control | |||
| safety monitoring | |||
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安 全 监测 : 18 phrases in 12 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| China | 4 |
| Cryptography | 1 |
| Electronics | 2 |
| Hydroelectric power stations | 3 |
| Rail transport | 1 |
| Sociology | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 1 |
| United Nations | 1 |
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