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保护层 : 144 phrases in 19 subjects |
| Astronautics | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Construction | 5 |
| Drilling | 2 |
| Electronics | 5 |
| Firefighting and fire-control systems | 1 |
| General | 32 |
| Household appliances | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 1 |
| Microelectronics | 5 |
| Military | 4 |
| Missiles | 1 |
| Name of organization | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 7 |
| Technology | 63 |
| United Nations | 11 |
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