a mental disorder characterized by episodes of mania and depression
双语例句
Bipolar disorder, also called manic-depressive illness, is not as common as major depression or dysthymia. 双相情感障碍，也叫做躁郁症，并不像重度抑郁症或心境恶劣一样普遍。
Some researchers suggest this mental state might share neurochemical characteristics with the manic phase of manic depression. 研究员提到，这一心理可能和狂躁的躁郁症有的神经化学特征。
