学会如何微笑，这才是自拍的正确打开方式
<p><span word="We">We</span> <span word="all">all</span> <span word="have">have</span> <span word="our">our</span> <span word="own">own</span> <span word="idea">idea</span> <span word="of">of</span> <span word="what">what</span> <span word="the">the</span> <span word="perfect">perfect</span> <span word="smile">smile</span> <span word="should">should</span> <span word="look">look</span> <span word="like">like</span>, <span word="whether">whether</span> <span word="we">we</span> <span word="show">show</span> <span word="a">a</span> <span word="mouthful">mouthful</span> <span word="of">of</span> <span word="pearly">pearly</span> <span word="whites">whites</span> <span word="or">or</span> <span word="keep">keep</span> <span word="our">our</span> <span word="lips">lips</span> <span word="closed">closed</span> <span word="and">and</span> <span word="turned">turned</span> <span word="up">up</span> <span word="at">at</span> <span word="the">the</span> <span word="corners">corners</span> <span word="just">just</span> <span word="so">so</span>. <span word="New">New</span> <span word="research">research</span> <span word="suggests">suggests</span> <span word="that">that</span> <span word="there">there</span> <span word="really">really</span> <span word="is">is</span> <span word="a">a</span> <span word="proper">proper</span> <span word="way">way</span> <span word="to">to</span> <span word="smile">smile</span>, <span word="and">and</span> <span word="it">it</span> <span word="has">has</span> <span word="everything">everything</span> <span word="to">to</span> <span word="do">do</span> <span word="with">with</span> <span word="facial">facial</span> <span word="expression">expression</span>.</p><p>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。</p><p><span word="When">When</span> <span word="we">we</span> <span word="think">think</span> <span word="of">of</span> <span word="the">the</span> <span word="perfect">perfect</span> <span word="smile">smile</span>, <span word="we">we</span> <span word="often">often</span> <span word="envision">envision</span> <span word="a">a</span> <span word="wide">wide</span>, <span word="beaming">beaming</span> <span word="grin">grin</span>, <span word="with">with</span> <span word="all">all</span> <span word="of">of</span> <span word="our">our</span> <span word="teeth">teeth</span> <span word="showing">showing</span>. <span word="However">However</span>, <span word="Nathaniel">Nathaniel</span> <span word="Helwig">Helwig</span> <span word="and">and</span> <span word="his">his</span> <span word="colleagues">colleagues</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Minnesota">Minnesota</span> <span word="discovered">discovered</span> <span word="that">that</span> <span word="a">a</span> <span word="genuine">genuine</span> <span word="smile">smile</span> <span word="actually">actually</span> <span word="rests">rests</span> <span word="less">less</span> <span word="on">on</span> <span word="showing">showing</span> <span word="teeth">teeth</span> <span word="and">and</span> <span word="more">more</span> <span word="on">on</span> <span word="facial">facial</span> <span word="balance">balance</span> <span word="and">and</span> <span word="symmetry">symmetry</span> .</p><p>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。</p>
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