退课选修课的英文

optional course/elective course/selective course都可以

选修课：elective course必修课：required course

选修课,必修课Elective course, compulsory course

compulsory course 必修课optional course 选修课

elective course(s)选修课 required/compulsory course(s)必修课

专业必修课：Professional compulsory course 公共选修课：public Selective course专业基础课：Professional Basic Course、Major Basic Course公共基础课Public Basic Course专业选修课Professional Selective Course任意选修课Optional Elective Course专业主干课Major Principal Course、实践环节Practical Stage供参考

觉得还是很不错的，但是推荐还是搜索一下工.众.呺手电校园

选修课：an elective course; a selective course; a selected course必修课：a required course; an obligatory course