Facial feedback theory testing was the main question of this study.

人脸反馈理论测试是本研究的主要问题。

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Psychologists have a theory called the facial-feedback hypothesis. It states that your mug and your emotions interact.

心理学家有一个理论，他们称之为“面部反馈假说”，即认为你的面部和情绪彼此呼应。

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Psychologists have a theory called the facial-feedback hypothesis.

心理学家们有一个面部表情反馈假说——表情和情绪是互相影响的。

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These findings would not have surprised Charles Darwin, who in addition to theorizing on evolution in The Origin of the Species, also developed the Facial Feedback Response Theory, which suggests that the act of smiling actually makes us feel better (rather than smiling being merely a result of feeling good).

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