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| unknown aetiology; unknown origin | |||
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原因不明 : 19 phrases in 11 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Dentistry | 1 |
| Economy | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| General | 5 |
| Nursing | 1 |
| Reproductive biology | 1 |
| Soviet | 1 |
| Space | 2 |
| Technology | 2 |
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