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　　Those forced to exercise their smiling musclesreacted more enthusiastically to funny cartoonsthan did those whose mouths were contracted in afrown, suggesting that expressions may influenceemotions rather than just the other way around.

　　译文：

　　在看一些有趣的卡通片时，那些被称迫做出笑脸的人比那些撅嘴、皱眉的人反应更加喜悦，这就表明表情可能会影响情绪，而不仅仅是情绪影响表情。

　　点睛：

　　句子的主干是：Those...reacted mare enthusiastically to...than did those。其中包含more....than...的比较结构，比较的对象是those forced to exercise their smiling muscles和thosewhose mouths were contracted in a frown这两种人。whose引导的是以those为先行词的定语从句。suggesting that...为分词结构，其中that引导的是suggesting的宾语从句，rather than意为“而不是”，theother way around意为“相反地，颠倒”。

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