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Erudition is the learning itself — a large store of knowledge built by careful study, especially of books, languages, history, or ideas. It is not “being clever in the moment”; it is what you have gathered over years.
Erudition博學（erudition） is指的是 the learning itself學問本身 built by careful study經過長期用心研究累積下來的 a large store of knowledge大量知識 especially of books, languages, history, or ideas尤其是書本、語言、歷史或思想方面的。 It它 is not不是 "being clever in the moment"「臨場反應機靈」 it它 is而是 what you have gathered over years你多年累積下來的東西
The word is formal and a little old-fashioned in everyday English.
The word這個詞 in everyday English在日常英語裡 is是 formal正式 and也 a little old-fashioned有點老派
A teacher might praise a student’s knowledge; a critic might praise a writer’s erudition.
A teacher老師 might praise可能會稱讚 a student's knowledge學生的knowledge（知識） a critic評論家 might praise則可能稱讚 a writer's erudition作家的erudition（博學）
Though actually, too much show of erudition can feel cold, as if the person is stacking facts instead of talking to you.
Though actually不過其實 too much show of erudition太過炫耀博學 can feel cold會讓人覺得冷冰冰的 as if the person is stacking facts好像這個人是在堆砌事實 instead of talking to you而不是在跟你說話
People also stretch it: a deep knowledge of one small field (old maps, baseball records) may be called erudition with a grin.
People also stretch it大家也會把這個詞用得更寬鬆: a deep knowledge of one small field對某個小領域有深入了解 (old maps, baseball records)（像是古地圖、棒球紀錄） may be called erudition with a grin也可能被半開玩笑地稱為erudition
First widely used in English in the 1400s.
First widely used最早廣泛使用 in English在英語裡 in the 1400s在1400年代
組成From Middle French érudition, from Latin eruditio (“instructing, learning”), from erudire (“to instruct,” literally “free from rudeness”), from e (“out”) + rudis (“rude”). By the look of the English word, erudite + -ion.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
eruditionnoun/ˌɛɹʊˈdɪʃən/
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Profound knowledge acquired from learning and scholarship.
- Professor Archimedes Q. Porter was their only immediate anxiety. Fully assured in his own mind that his daughter had been picked up by a passing steamer, he gave over the last vestige of apprehension concerning her welfare, and devoted his giant intellect solely to the consideration of those momentous and abstruse scientific problems which he considered the only proper food for thought in one of his erudition.
- As a philosopher he was superior to Lenin in all respects: erudition, knowledge of his subject, independence of thought, and skill in formulating problems.
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The refinement, polish and knowledge that education confers.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。