• 1. 是主课: The main course | Is the main subject | Is a main course
• 2. 他们是主课老师: They are main subject teacher | They are the main teacher
• 3. 数学是一门主课: Mathematics is a main subject

更多释义

• 1.高校德育工作是一项极其复杂的系统工程，是进行思想道德教育的主渠道、主阵地和主课堂。
  The work of college moral education is an extremely complex system engineering, it is the main channel, main position and main classroom for moral education.
  dict.yoduao.com
• 2.如果你的主课是有条件录取，条件是完成学前语言课程，那么你会先只拿到一个语言课的签证。
  If your entry to the main course is conditional based on successful completion of your pre-sessional programme, you will get an initial visa for the pre-sessional programme only.
  dict.yoduao.com

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