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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  and in a sense they do.
  在某种程度上它们的却是一样
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  If we slice the first one, and turn it,
  如果我们切开第一个 翻转过来
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  it's oval for the same reason as before;
  它是椭圆形的 原因和之前一样
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  there's a p orbital pointing in and out of the board,
  有一个p轨道方向垂直于平面
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  and if we look at it below,
  看下面这张图
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  part of the bond is caused by overlapping,
  这个键有部分是由重叠轨道构成的
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  as we'll see, of those p orbitals.
  就是这些p轨道
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  So it's got an oval, up and down shape.
  所以它是椭圆形 上下突出
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  How about the next one?
  那么下一个键呢
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  If we slice it and turn it,
  如果我们把它切开翻转
• 
  
  it's also oval in cross-section,
  横截面还是椭圆形
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  but perpendicular. Right?
  但方向与前一个垂直