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保护圈 : 29 phrases in 10 subjects |
| Aviation | 2 |
| Ecology | 1 |
| Electronics | 2 |
| Environment | 1 |
| General | 7 |
| Name of organization | 1 |
| Oil and gas | 1 |
| Skydiving | 1 |
| Technology | 8 |
| United Nations | 5 |
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