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global positioning system |
全球定位导航 系统 : 30 phrases in 13 subjects |
Air defense | 2 |
Automobiles | 1 |
Aviation | 9 |
Cartography | 1 |
Communications | 2 |
Earth sciences | 2 |
Electronics | 2 |
Information technology | 1 |
Nautical | 2 |
Navigation | 1 |
Space | 3 |
Technology | 2 |
United States | 2 |