1. 症状
    A symptom of an illness is something wrong with your body or mind that is a sign of the illness.

    e.g. One of the most common symptoms of schizophrenia is hearing imaginary voices.
           精神分裂症的最常见的一个症状就是幻听。
    e.g. ...patients with flu symptoms...
           有流感症状的病人

2. 征候;征兆
    A symptom of a bad situation is something that happens which is considered to be a sign of this situation.

    e.g. Your problem with keeping boyfriends is just a symptom of a larger problem: making and keeping friends...
           你在维系同男友的关系时遭遇的困难暴露了一个更大的问题：如何结交朋友和维持友谊。
    e.g. The contradictory statements are symptoms of disarray in the administration.
           这些互相矛盾的说法反映了管理的混乱。