learned: implies academic knowledge gained by long study and research and is applicable to persons, their associations, OR their writings and professional publications: members of a ~ society. (Academy希腊地名，柏拉图曾在此创建哲学学院，现在表示学院学会等专业学习学术机构，形容词academic表示和学习学术相关，如academic scores学习成绩，本例academic knowledge学术知识，这个词有时暗示专注抽象知识，缺乏实际经验abstractness and lack of practical experience，如the economist's concerns seemed more academic than practical这位经济学家似乎更关注学术而非现实方面 ) （study和research都表示研究，即认真细致地分析评判，区别是study还有学习to learn的意思，research还有探索发现to explore and discover的意思，汉语为了强调学习也经常说成"学习研究"）
scholarly: implies learning and applies particularly to persons who has attained mastery of a field of knowledge or to their utterances, ideas, or writings: a ~ study of the causes of war. (master掌握、大师；mastery精深精湛；masterpiece杰作) 对战争起因进行了精深的学术研究
erudite: sometimes interchangeable with learned and scholarly, can imply a love of learning for its own sake, a taste for out-of-the-way knowledge, or even mere pedanticism: a mind filled with ~ and arcane lore. （pedantic学究气的，过度关注知识细节，如his lecture was so pedantic and uninteresting他的讲座学究气太浓，没意思）
learned学识的学术的: 指懂学术知识，进行过长时间的学习研究，既可指人也可指作品，scholarly学者的学术的: 形容精通某领域知识的人或其作品，erudite渊博好学: 可替代前两词表示知识渊博，还表示对知识的喜爱。
记忆方法：1）首字母LSE想成SEL挑选，博学的人善于挑选
2）博学的意思是指有渊博的知识mean possessing or manifesting unusually wide and deep knowledge.
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