symptom [ˈsɪmptəm]

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n.症状，征候，征兆

any feeling of illness or physical or mental change which is caused by a particular disease

The crime rate is a symptom of social unrest. 犯罪率是社会不安定的征兆。
Fever is a symptom of many illnesses. 发烧是许多疾病的征兆。