required
adjective5 搭配平均频率: 7.4
a mandatory course in a curriculum
必读材料
texts that must be read for a course or on a particular subject
课程或特定主题必须阅读的文本
the necessary standard of proficiency or attainment
the lowest amount or level that is demanded
a mandatory course in a curriculum
必读材料
texts that must be read for a course or on a particular subject
课程或特定主题必须阅读的文本
the necessary standard of proficiency or attainment
the lowest amount or level that is demanded