来自《耶鲁大学开放课程：新生有机化学 第7集 第7集》

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  divided by the amplitude at this point?
  除以振幅是什么值
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  Is it positive, negative or zero?
  是正的 还是负的 还是为零
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  So what's the curvature at that point?
  那一点的曲率是多少
• 
  
  Is it curving up or down at that point?
  在这一点是向上弯曲还是向下
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  No idea. Anybody got an idea? Keith? Kevin?
  不知道吗 凯文你知道吗
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  It looks like a saddle point so it's probably zero.
  看上去像个鞍点所以曲率应是零
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  It's not a saddle point.
  那不是鞍点
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  What do you call it?
  应该怎么称呼
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  Inflection points.
  拐点
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  A saddle point's for three dimensions.
  在三维空间中叫鞍点
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  In this it's what? Inflection point.
  在一维空间叫拐点
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  It's flat there.
  在这一点是平坦的