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| trouble-free servi ce | |||
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无故障工作 : 27 phrases in 9 subjects |
| Air defense | 1 |
| Automobiles | 8 |
| Aviation | 1 |
| Economy | 1 |
| Electronics | 7 |
| Hydroelectric power stations | 1 |
| Space | 4 |
| Technology | 2 |
| Wind Energy | 2 |
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