四级听力场景词汇学生场景freshman大一学生sophomore大学二年级生,有二年经验的juniorstudent大三学生seniorstudent大四学生,高年级学生undergraduatestudent本科生graduatestudent/postgraduatestudent研究生master'sdegree硕士学位bachelor'sdegree学士学位doctorstudent/doctorcandidate博士研究生postdoctorstudent博士后alumni/alumnus校友老师场景professor教授teachingfellow讲师tutor/mentor/director/supervisor导师dean系主任department系president校长staff全体员工(商店、企业)faculty全体教职员工上课、选课、听讲座、听报告场景takethecourse选课dropthecourse退课register注册signupforthecourse选课Pickup=learncancel取消full报满selectivecourse/electivecourse/optionalcourse选修课requirement/requiredcourse/compulsory必修课lecture讲座seminar讨论班credit学分introductorycourse初级课程advancedcourse高级课程math数学computercourse计算机psychologycourse心理学physics物理学economics经济学computerscience计算机科学sociology社会学geology地质学chemistry化学biology生物学biochemistry生物化学science理科作业场景