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断 -通开关 : 13 phrases in 9 subjects |
| Architecture | 1 |
| Automobiles | 3 |
| Electric machinery | 1 |
| Electronics | 1 |
| Geophysics | 2 |
| Metallurgy | 1 |
| Space | 2 |
| Technology | 1 |
| Telecommunications | 1 |
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