knowledge: applies to facts or ideas acquired by study, investigation, observation, or experienence: rich in the ~ gained from life.       （如a thirst/quest for knowledge渴望/追求知识，如a knowledge of carpentry/law懂木工/法律，public knowledge众所周知，common knowledge通识(一般人都知道的知识)，而common sense是常识(一般人都具备的理性智慧）；词组to one's knowledge据某人所知，如"did anyone arrive late?" "not to my knowlege"有人迟到么？据我所知没有，加上the best表示尽某人所知，如I answered their questions to the best of my knowledge尽我所知回答他们的问题）  谚语knowledge is power知识就是力量，a little knowledge is a dangerous thing浅学误人(事)


learning: applies to knowledge acquired especially through formal, often advanced, schooling and close application: a book that is evidence of the author's vast ~.    本例作者极为博学，还可以用great/considerable形容，book learning书本知识[=knowledge gained from reading books]是固定搭配    vast极大的


erudition: strongly implies the acquiring or possession of profound, recondite, or bookish learning: an ~ unusual even for a classicist.    又如his erudition was apparently endless他显然有无限渊博的学问，形容词erudite: an erudite professor/essay学识渊博的教授/散文，a mind filled with erudite and arcane lore深奥而神秘的学问，在2017-07-07 博学learned-erudite组，   recondite深奥晦涩深邃[邃=深]的not known about or understood by many people，较少使用, bookish书卷气的refers to a person who spends a lot of time reading serious books  


scholarship: implies the possession of learning characteristic of the advanced scholar in a specialized field of study or investigation: a work of first-rate literary ~.  scholarship既表示学术研究serious study，如meticulous scholarship一丝不苟的学术研究；也表示由此获得的学识knowledge，如academic/biblical/literary scholarship研究学术/圣经/文学的学识


knowledge知识: 指对事实的认知，通过学习调查观察经历，learning学识: 指通过正式深入学习获得的知识，erudition学识渊博: 强调渊博深邃的知识，scholarship学者学识学术水平: 指高级学者具有的专业学术知识


记忆方法：1） 首字母SLEK舒蕾洗发水<==知识    联想记忆只是为了看到A能想到B，未必符合逻辑

          2）练习一下

          3）知识的意思是能被人知道的mean what is or can be known by an individual or mankind.首字母SLEK舒蕾洗发水<==知识 联想记忆只是为了能看到A想到B，无论是否符合逻辑