1.  required
2.  obligatory

• 1. 必修: Obligatory | compulsory | a required course
• 2. 必修课: required course | compulsory course | Compulsory | required
• 3. 必修的: compulsory | Required | Required course

更多释义

• 1.某些课程是必修的，其他是选修的。
  Certain courses are compulsory, others are optional.
  dict.yoduao.com
• 2.英语在这一级别是必修科目。
  English is a compulsory subject at this level.
  dict.yoduao.com
• 3.有一门统计学的必修课。
  There is a compulsory course in statistics.
  dict.yoduao.com

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