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| кольцо безопасности | |||
| аварийное кольцо | |||
| предохранительное кольцо | |||
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安 全 环 : 49 phrases in 12 subjects |
| Diplomacy | 1 |
| Ecology | 2 |
| Electronics | 3 |
| Environment | 3 |
| Firefighting and fire-control systems | 3 |
| Food service and catering | 1 |
| General | 30 |
| Security systems | 1 |
| Shipbuilding | 1 |
| Skydiving | 1 |
| Technology | 1 |
| United Nations | 2 |
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