来自《耶鲁大学开放课程：新生有机化学 第6集 第6集》

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  Compared to what?
  跟什么比
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  Compared to what? Right?
  跟什么比
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  In that case it turns out it's compared to observed
  在这个问题中 它是比较观察到的
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  or calculated energy.
  或者计算到的能量
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  Compare the observed or calculated energy,
  要跟你所预计的非共振结构的情况相比
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  to what you would expect if it were not resonant.
  比较观察到的或者计算到的能量
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  And we'll talk later about how, on what basis,
  晚一点我们会讨论该如何进行预测
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  you might have an expectation.
  在什么基础上进行预测
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  Now we're talking about difference electron density.
  现在我们先来看电子密度差
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  So what do we compare?
  我们在比较什么
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  We compare experimental electron density,
  我们比较的是实验得出的电子密度
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  or could be calculated,
  或者是计算得出的