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按电钮 : 49 phrases in 13 subjects |
| Architecture | 2 |
| Aviation | 5 |
| Communications | 1 |
| Drilling | 1 |
| Electronics | 5 |
| Fencing | 1 |
| General | 3 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Racing and motorsport | 1 |
| Shipbuilding | 3 |
| Space | 2 |
| Technology | 23 |
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