abyss
well-informed
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erudite
erudition, well-informed, extremely knowledgeable
他 的 學問 很 淵博。
His knowledge is very erudite.
這 位 老師 十分 淵博。
This teacher is very erudite.
他 是 一 位 淵博 的 學者。
He is an erudite scholar.