a.[Z]
1. 不正常的,反常的;不规则的
It is abnormal for a man to walk in his sleep.
梦游是不正常的。
2. 异乎寻常的,例外的
An abnormal amount of snow fell here last week.
上周这里下了异常大的雪。
3. 变态的;畸形的
It is important to make a study of abnormal psychology.
研究变态心理学是重要的。