一个混合的学生群体可以改变课堂的活力，有利于学生学习。

A mixed student body may change the classroom dynamics and benefit learning.

youdao

下午我通常感觉又累又困，从而影响了课堂的活力。

I'm usually so tired and sleepy in the afternoon, which really affects the vitality of my classes.

youdao

奎克说：“我发现在空军服务的日子给我带来了活力，这种活力是我十分需要的，此外我还收获了一些互补性的真实世界经验，我可以将这些经验带回到课堂上。”

"I found that my time in the Air Force provided much-needed rejuvenation as well as complimentary real-world experience to bring back to the classroom," he says.

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So you can imagine that adds real excitement and energy to the class and puts a little bit pressure on the professors to make sure that we have something worth coming half way around the world for.

可以想象,为课堂带去的兴奋和活力,也给教授施加了压力，我们要确保,能传授值得绕半个地球赶来学习的知识。

哈佛公开课 - 幸福课课程节选