来自《耶鲁大学开放课程：新生有机化学 第3集 第3集》

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  have O2
  先画成O2
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  and bring in another oxygen on one of the lone pairs.
  再将另一个氧连结到其中一对未成对电子上
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  Now that's not an equilateral triangle;
  这不是一个等边三角形
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  it's a triangle,
  而是一个三角形
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  or it could conceivably be a straight line,
  当然也可能是直线结构
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  we're not quite sure what the geometric implications are.
  我们不能肯定它的几何结构
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  Okay, but we could call it an open structure
  但我们可称之为开放结构
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  as compared to the ring structure.
  这是相较于环状结构来说的
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  And we can draw it like that,
  我们可以这样画
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  and the formal charges would be as shown.
  那么它的形式电荷分布就像这样
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  Why?
  为什么
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  Because that pair that originally belonged only to
  因为原本只属于O2顶端