来自《耶鲁大学开放课程：新生有机化学 第7集 第7集》

• 
  
  is some pathologies of bonding,
  路易斯的共用电子对化学键理论下的
• 
  
  from the point of view of Lewis concept of shared electrons.
  一些病态的键
• 
  
  Okay, so here's a picture of this molecule.
  这是这个分子的图片
• 
  
  And remember, we had -- rubofusarin,
  还记得上节课那个红链霉素吗
• 
  
  which we looked at last time,
  它所有的原子都在一个平面上
• 
  
  had the great virtue that it was planar.
  这是个很棒的优点
• 
  
  So you could cut a slice that went through all the atoms.
  只要做一个截面就能包含所有的分子
• 
  
  This molecule's definitely not planar,
  而现在这个分子明显不是平面的
• 
  
  so you have to cut various slices to see different things.
  所以需要多做几个截面才能得到所有信息
• 
  
  So first we'll cut a slice that goes through those ten atoms.
  首先我们来取包含了这10个原子的截面
• 
  
  And here is the difference electron density.
  来看看电子密度的分布
• 
  
  What does the difference density show?
  这能告诉我们什么呢