The professor's erudition came from long years of study.
这位教授
学问

年累月
钻研。
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福单词
辑 

Dr Dunbar, a professor of evolutionary anthropology with a study in this week's science section (see article), is best known for “Dunbar's number”, the limit to the number of people with whom one can maintain stable social relationships.
邓巴博士是进化人类学的教授,本期科学专栏刊登了一篇他的研究,令他广为人知的是“邓巴数字”,即一个人最多可以拥有的稳定社交关系的人数。