In fact another name for this sickness is manic depression.

事实上，这种疾病的另一个名字是躁郁症。

You've probably heard of manic depression.

你可能听说过躁狂抑郁症。

Bipolar disorder, which used to be called manic depression, is a serious mental illness that causes a person to have dramatic shifts in emotions, mood, and energy levels: moving from extreme lows to extreme highs.

双相障碍过去被称为躁狂抑郁症，是一种严重的精神疾病；它会导致一个人情绪、心境和精力水平急剧变化，从极低的水平变化到极高的水平。