The pupil of the eye dilates and contracts in response to light.
为对光

的反应,眼睛的瞳孔会放大或
小。
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Those forced to exercise their smiling muscles reacted more enthusiastically to funny cartoons than did those whose mouths were contracted in a frown, suggesting that expressions may influence emotions rather than just the other way around.
那些被迫锻炼微笑肌肉的人比那些嘴巴收缩成皱纹的人对有趣的动画片反应更热烈,这表明表情可能影响情绪,而不是相反。
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济学人(汇总)