土偶寄宿制
两种都可。elective/optional course： 选修课 Optional Elective Course： 任意选修课 例：This course is a specialized optional course for overseas undergraduates who major in Chinese.本课程是为汉语言专业本科的外国留学生开设的一门专业选修课。Is that optional course as hard as everybody says?那个选修课真的就像每个人说的那样难吗?In college, English is a required course and psychology is an elective course.在大学里，英语是必修课而心理学是选修课。This is a elective course based on the study of the thoughts of Marx on historiography.“马克思史学思想研究”是根据作者多年精心研究而设计的一门选修课程。
