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| action center | |||
| 行动中心: 18 phrases in 9 subjects |
| Aviation | 4 |
| Desert science | 3 |
| Ecology | 1 |
| Electronics | 2 |
| Name of organization | 1 |
| Space | 3 |
| Technology | 1 |
| United Nations | 2 |
| United States | 1 |
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