来自《耶鲁大学开放课程：心理学导论 第11集》

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  a reliable relationship between how happy somebody is now
  在某人现在的开心指数和三十年前
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  and back thirty years ago in their yearbook photo--
  他们在纪念册上是怎样微笑的
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  what sort of smile they're giving.
  有一个很可靠的联系
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  There is some evidence for a third sort of smile.
  还有一些研究表明可能还有第三种微笑
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  This is known as a coy smile or an appeasement smile.
  有时被称为腼腆的微笑或者缓和的微笑
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  This is sort of a very specialized sort of smile.
  这是一种有特殊目的的微笑
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  This is a smile of embarrassment or stress.
  它表达的是尴尬或者紧张
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  You give it
  你这么笑时
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  when you want people to like you,
  你希望别人能喜欢你
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  you want to join in;
  你希望能加入
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  you want to make people feel positive about you.
  你希望别人对你有个好印象
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  But you're in, sort of, a high-stress situation
  但是你往往处于一种有风险的