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We all have our own idea of what the perfect smile should look like, whether we show a mouthful of pearly whites or keep our lips closed and turned up at the corners just so. New research suggests that there really is a proper way to smile, and it has everything to do with facial expression. 完美的微笑应该是什么样子的呢，是露出一口大白牙，还是抿起双唇并使嘴角上扬，对此我们都有自己的想法。一项新研究指出，确实是有正确的微笑方式的，而且这与面部表情密切相关。 When we think of the perfect smile, we often envision a wide, beaming grin, with all of our teeth showing. However, Nathaniel Helwig and his colleagues at the University of Minnesota discovered that a genuine smile actually rests less on showing teeth and more on facial balance and symmetry . 当我们想起完美的微笑的时候，我们往往想象的是喜气洋洋且露出所有牙齿的微笑。然而，明尼苏达大学的纳撒尼尔·赫尔维希和他的同事们发现，真正的微笑实际上并不在于露出几颗牙齿，而更多地在于面部表情的均衡和对称。 | 
