Studies show that distraction is a powerful mood-altering device.
研究表明，转移注意力是改变心情的强有力方法。
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Like Smack Santa, they spend many hours playing roles that don't match their innate personalities and preferences, dulling the pain with mood-altering substances.
Butterflies in the stomach are often seen as a positive and harmless sign of subconscious feelings for romantic interest and are caused by the release of mood-altering endorphins.