bipolar disorder
(亦作 bipolar affective disorder)
noun
mass noun
- a mental condition marked by alternating periods of elation and depression双相型障碍（一种躁狂和抑郁交替出现的精神疾患）。
USAGE
The terms bipolar disorder or bipolar affective disorder are increasingly being used in place of manic depression. See usage at MANIC DEPRESSION.