Moody people are often baffling to those of us with steadier emotions.

喜怒无常的人常常令情绪稳定的人感到困惑。

But scientists argue that changing moods – as seen in sulking teenagers, grumpy spouses, or bad-tempered parents - serve an important purpose.

但科学家认为情绪多变——多见于阴郁的青少年，爱发牢骚的配偶，或者暴脾气的父母——其实有它的重要目的。

Rather than being a weakness, they are nature's way to of helping us adapt to an ever changing world. So when times are good and spirits are high, we take more risks at a time they are likely to be rewarded.

这不是缺点，而是帮助我们适应瞬息万变的世界的自然方式。

And when times are tough, sulking can help us conserve our energy.

当万事顺意、志得意满时，我们更倾向于去冒风险，因为我们觉得自己很可能会得到回报。当时局艰难时，阴郁的情绪可以帮我们保存能量。

To take a human example, a stock market trader who makes a successful deal becomes more optimistic about the outcome of his next transaction.

举人类为例，股市交易者大赚一笔时，他对下一笔交易将会信心满满。

He is then likely to take more risks – as he becomes more optimistic things will go in his or her favour.

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