来自《耶鲁大学开放课程：新生有机化学 第2集 第2集》

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  to do it for a certain period of time.
  有权在某一时期使用该技术
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  Latent means it's hidden.
  潜就是隐蔽
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  So there's a hidden valence, these loops,
  所以这些环是潜在的键
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  but they can become available, right?
  它们也的确有用
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  It must be assumed in some cases,
  有时我们必须这样假设
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  as for example the combination of ammonia with hydrochloric acid.
  比如氨与盐酸发生的化合反应
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  Now, so you can get a reaction and get the product,
  反应得到的产物中
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  which has all five valences of nitrogen now.
  就有五价的氮元素
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  But how do you know there's not another loop on nitrogen,
  但氮上是否还有其他这样的环呢
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  that you could break open
  我们可以把这些环也打开
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  and make it seven valent, or nine, or eleven?
  得到七价 九价 甚至十一价的氮呢
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  Or maybe you could break a loop into three.
  又或者 一个环还可以拆成三价