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| non scheduled maintenance | |||
| nonperiodical repair | |||
| unscheduled maintenance | |||
| non-routine maintenance | |||
| non-scheduled maintenance | |||
| 不定 期 维修: 8 phrases in 4 subjects |
| Aviation | 5 |
| Hydroelectric power stations | 1 |
| Materials science | 1 |
| Telecommunications | 1 |
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