the aetiology of disease 病因学
causal aetiology 因果成因
study of aetiology 病因研究
A: Have they determined the aetiology of the sudden outbreak?
A：他们确定这次突发疫情的病因了吗？
B: Not yet, but more clinical studies are needed.
B：还没有，但还需要更多的临床研究。
1) 医学中研究疾病起源的学科
2) 某种现象或问题的成因或起源
1. 病因学；成因
noun
1. The study or cause of a disease or other matter.
Synonym: causation, origin