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| 观察系统 | |||
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observing systems : 60 phrases in 14 subjects |
| Aviation | 7 |
| Desert science | 2 |
| Earth sciences | 17 |
| Ecology | 2 |
| Electronics | 4 |
| Environment | 1 |
| Geography | 1 |
| Geophysics | 4 |
| Name of organization | 5 |
| Remote sensing | 1 |
| Space | 7 |
| United Kingdom | 1 |
| United Nations | 7 |
| United States | 1 |
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