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| 难题报告 | |||
| 事故报告 | |||
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| 故障报告 | |||
| trouble report: 29 phrases in 6 subjects |
| Aviation | 10 |
| Business | 9 |
| Economy | 1 |
| Electronics | 5 |
| Space | 3 |
| Technology | 1 |
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