Exercise releases hormones that can improve mood and relieve stress, which can also help learning.

锻炼能释放可以改善情绪和缓解压力的荷尔蒙，这也有助于学习。

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Also, research shows that DHA can help improve mood and fight depression.

此外，研究表明，DHA可以帮助改善情绪和抵御忧郁症。

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Research suggests that light stimulates brain chemicals that improve mood.

缺少阳光，长时间在室内呆着会容易让人感觉到疲劳，研究证明阳光可以刺激大脑内的化学物质从而达到愉悦心情的效果。

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That would not improve the mood when OPEC next gathers in December.

ECONOMIST: Disharmony at OPEC breeds uncertainty over the oil price

For any behaviour to be defined as addictive, there have to be specific consequences such as it becoming the most important activity in the person's life or being the way they improve their mood.

BBC: Why anything can be addictive

The response from Mr Singh should be a push to explain to Congress and the country how reforms to land ownership or government efficiency or the retail sector would help to improve the mood and hence India's economic fortunes.

ECONOMIST: India��s political paralysis