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| 美国太空侦察监视系统 | |||
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| 空间监视和跟踪系统 | |||
| 天基监视与跟踪系统; 空间监视跟踪系统 (美国 SDI 中的); 空间监视与跟踪系统 | |||
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Space Surveillance and Tracking System : 8 phrases in 4 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Electronics | 1 |
| Space | 5 |
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