busy: stresses activity as opposed to idleness or leisure: too ~ to spend time with the children.


industrious: implies characteristic or habitual devotion to work: a people ~ by nature.   (characteristic特色的特别的，habitual习惯性的)


diligent: suggests earnest application to some specific object or pursuit: very ~ in her pursuit of a degree.   （earnest认真热情=sincere真诚认真+zealous热情）（pursuit事业：投入很大热情的工作，如IT is his pursuit IT是他的事业） 勤劳和勤奋强调的是行动上的努力，多用于工作或学习，较口语化


assiduous: stresses careful and unremitting application: mastered the piano only after ~ practice.   (assiduous想象成像ass驴一样认真不懈地工作)   勤勉比勤劳勤奋更强调态度上的不懈怠(文中unremitting)或谨慎(文中careful)，更正式，如勤勉地履行义务/练习钢琴


sedulous: implies painstaking and persevering application: a ~ reconstruction of the events of that night.   (painstaking形容研究调查等极其仔细谨慎，persevering毅力)


busy忙碌: 强调活动而非空闲休闲，industrious勤劳: 指特别地习惯性的投入工作，diligent勤奋: 指认真热情地致力于目标事业(application应用这里译成致力于)，assiduous勤勉: 形容认真谨慎坚持不懈地致力于，sedulous也是勤勉: 形容极其勤勉（认真谨慎坚持不懈地致力于），语气更强


记忆方法: 1) 首字母排序为IS BAD不好<==忙碌

        2）忙碌的意思是积极从事mean actively engaged or occupied.首字母排序为IS BAD不好<==忙碌