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In a recent mimicking study at the University of Clermont-Ferrand in France, subjects were asked to determine whether a smile was real or fake while holding a pencil in their mouth to repress smiling muscles.
法国克莱蒙费朗大学近期的一项模拟研究要求研究对象通过微笑肌肉把一支铅笔含在嘴上，以此判断微笑的真假。
Without the pencil, subjects were excellent judges, but with the pencil in their mouth -- when they could not mimic the smile they saw -- their judgment was impaired.
在不含铅笔的情况下，研究对象都能够轻松做出判断，但当他们含着铅笔时，他们无法模仿眼前的微笑，也就无法正确判断。
In addition to theorizing on evolution in "The Origin of Species," Charles Darwin also wrote the facial feedback response theory.
除了在《物种起源》中提出进化论，查尔斯· 达尔文还提出了面部反馈理论。
His theory states that the act of smiling itself actually makes us feel better, rather than smiling being merely a result of feeling good.
这里理论提到微笑这一行为实际上能让我们的心情变得更好－－而不仅仅是心情好的产物。
In his study, Darwin actually cited a French neurologist, Guillaume Duchenne, who sent electric jolts to facial muscles to induce and stimulate smiles.
在他的研究中，达尔文援引了法国神经学家Guillaume Duchenne的研究，他通过给面部肌肉做电颤刺激来产生微笑。
Please, don't try this at home.
请不要在家里模仿。
