1.  in session
2.  at school
3.  at achool

• 1. 在上课: at school | in class | in session
• 2. 在上课时: In class
• 3. 在上课期间: During the class | During the school day

更多释义

• 1.我在上课学防身术。
  I'm taking classes in self-defence.
  dict.yoduao.com
• 2.她认为在上课前付费是不明智的。
  She doesn't think it wise to pay before attending any class.
  dict.yoduao.com
• 3.你应该在上课前把作业交上来。
  You should hand in the homework before you come into class.
  dict.yoduao.com

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