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| 开关系统 | |||
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switch system : 27 phrases in 9 subjects |
| Automobiles | 3 |
| Aviation | 3 |
| Electronics | 7 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Rail transport | 4 |
| Securities | 1 |
| Space | 3 |
| Technology | 4 |
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