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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The trouble is it's too slippery a concept.问题在于这个概念太全能 -
It explains everything.用它什么都说得通 -
You could explain anything you wanted to.你想怎么说就能怎么说 -
You could explain eighty-four valence of nitrogen or something.你可以把氮说出84个价态来 -
Anything that comes along, you'd say,无论遇到什么 你都可以说 -
"Ah ha, there are that many latent valences."啊哈 这里有不少的潜价 -
But how do you know there are not more?但究竟有多少呢 -
Why do you have latent valences?为什么会有潜价存在呢 -
When do you have them?它该放在什么时候用呢 -
When and why do you have partial dissociation?这种键的部分的解离又是怎样发生的 -
This thing didn't explain anything, or explained everything.这个概念要么包罗万象 要么废话一句 -
Now, at this point I want you to smile来现在大家都笑一笑