选修课的英文是optional course还是elective course

那个optional course和elective course相比哪个的自由度差点? optional course和elective course有什么区别? 选修课 英文选修课的英文是voluntary course吗?必修课的英文是required course吗? specialized course,restricted optional course ,general optio “当然不”的英文是“Of course not”还是“Of course no” 课程设计的英文是Curriculum Design还是Course Design of course的英文 course的简写是cuz还是coz selective course和optional course有什么区别? "course" course. i have to go for the optional course