| |||
| 跟踪与数据系统 | |||
| 跟踪和数据系统 | |||
|
tracking and data system : 20 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Earth sciences | 3 |
| Electronics | 4 |
| Information technology | 1 |
| Space | 5 |
| Technology | 1 |
| United States | 1 |
| |||
| 跟踪与数据系统 | |||
| 跟踪和数据系统 | |||
|
tracking and data system : 20 phrases in 8 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Earth sciences | 3 |
| Electronics | 4 |
| Information technology | 1 |
| Space | 5 |
| Technology | 1 |
| United States | 1 |