To be extensively knowledgeable about both ancient and modern times; well-versed in history and contemporary affairs.
这位学者通古博今，每次讲座都能深入浅出地阐述复杂的理论，令人受益匪浅。
This scholar is extensively knowledgeable about both ancient and modern times; every lecture he gives can explain complex theories in an accessible way, which is very enlightening.
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