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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  and also on the right here is negative kinetic energy.
  同样这里也是负动能
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  And here we know, just by continuity,
  同样根据连续性
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  that at this point it must've been positive kinetic energy,
  在这一点动能为正
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  even though we couldn't tell it by looking at the curve.
  虽然从曲线上无从判断
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  There must be an inflection point when you go through zero,
  当经过零点时必然存在一个拐点
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  otherwise you'd get a discontinuity in the potential energy.
  否则势能就不连续了
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  Okay, so that one was green.
  所以那一点标记为绿色
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  Okay, now I have to stop.
  今天就到这