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| observation group (美国陆军航空中心， 美国陆军航空兵) | |||
| observation group; an observation group | |||
| series of observations | |||
| 观察组: 10 phrases in 8 subjects |
| Business | 2 |
| Commerce | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| General | 1 |
| Name of organization | 1 |
| Space | 1 |
| Technology | 2 |
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