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subluevoyage
elective course(s)选修课 required/compulsory course(s)必修课
哇塞小熊
mandatory courseoptional course
Lemonice柠檬冰
required course 必修课elective course 选修课
hereparadox
electiveprescribed /obligatory
金牌大素包
必修课 [简明汉英词典] a required course选修课 [简明汉英词典] elective course
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