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checkout system : 107 phrases in 15 subjects |
| Air defense | 1 |
| Architecture | 2 |
| Automobiles | 2 |
| Aviation | 35 |
| Business | 1 |
| Earth sciences | 4 |
| Electronics | 26 |
| General | 2 |
| Information technology | 1 |
| Mechanics | 2 |
| Metallurgy | 1 |
| Navigation | 1 |
| Space | 18 |
| Technology | 9 |
| Wind Energy | 2 |
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