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重复环 : 32 phrases in 12 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Electronics | 1 |
| Environment | 1 |
| General | 3 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Polymers | 1 |
| Power system protection | 4 |
| Space | 1 |
| Technology | 12 |
| Telecommunications | 3 |
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