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故障时工作时间 : 22 phrases in 10 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 3 |
| Business | 2 |
| Economy | 1 |
| Electronics | 6 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Space | 5 |
| Wind Energy | 1 |
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