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unknown aetiology; unknown origin |
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 |