• 1. Be Active in Class-: 上课要积极
• 2. Be Active in Class: 上课要积极 | 课堂上活跃 | 在课堂上很活跃

• 1.Mr.Smith always encourages his students to be active in class．
  史密斯先生总是鼓励学生在课堂上要活跃。
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• 2.Be more active in class, so that you can improve your ability to express yourself.
  在课堂上要更加积极，这样才能提高自己的表达能力。
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• 3.To be active in academic and in-class discussions.
  能积极主动地参加学术研讨或导师主持的课堂讨论。
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