双相情感障碍导致激烈地在过分地高亢和/或易怒到悲伤与无望之间反复的情感波动，同时，常常有一个平稳的间歇期在两者之间。

Bipolar disorder causes dramatic mood swings from overly "high" and/or irritable to sad and hopeless, and then back again, often with periods of normal mood in between.

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在2007 - 08年小麦价格持续上升了数月；与此相对，现今小麦价格波动剧烈反复无常。

In 2007-08 prices rose continuously for months. In contrast, prices recently have been volatile.

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反复的电压波动引起白炽灯光度的变化。

Repetitive voltage fluctuations cause brightness variations in incandescent elements.

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