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| 跟踪数据 | |||
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tracking data : 118 phrases in 14 subjects |
| Agriculture | 1 |
| Air defense | 6 |
| Aviation | 23 |
| Business | 1 |
| Computer networks | 1 |
| Earth sciences | 12 |
| Electronics | 18 |
| General | 2 |
| Geophysics | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Space | 41 |
| Technology | 7 |
| United States | 3 |