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按 钮 的 : 36 phrases in 10 subjects |
| Automobiles | 9 |
| Aviation | 2 |
| Construction | 1 |
| Electronics | 7 |
| General | 6 |
| Geophysics | 1 |
| Project management | 1 |
| Space | 2 |
| Technology | 5 |
| Telecommunications | 2 |
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