N-COUNT The missing link in a situation is the piece of information or evidence that you need in order to make your knowledge or understanding of something complete. 缺少的环节; 指为完全理解某事尚需知道的一则信息或证据 [usu sing]
We're dealing with probably the biggest missing link in what we know about human evolution.
我们正在解决的可能是我们所知的人类进化过程中缺失最大的一环。
Yet there are missing links in this equation, because many smokers never develop lung cancer.
但在这一等式中尚有缺失环节，因为，很多吸烟者从未患上肺癌。
What do the fossil records work in finding the missing links?
化石记录对发现缺失环节有何作用？
So it is to the fossil record that we must look to find the missing links.
因此，我们必须通过化石记录找到那些所缺失的环节。
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