那天一到换课的时候，她就冲着博博笑。

She smiled at B.B. when they switched classes that day.

youdao

凡交费学员自交费之日起七日内可以退课、换课。

You can change courses or ask for refund within seven days after payment.

youdao

帝国理工商学院保留换课的权利，不管什么时候当课程需要修改或者提高。

Imperial College Business School reserves the right to alter courses whenever they need to be amended or improved.

youdao

Let me put it that way; I hope we don't spend a week talking about that one because that's not what I thought Biomedical Engineering was.

换句话说,我可不想花费一周课来讨论这种问题,因为我觉得那不属于生物医学工程

耶鲁公开课 - 生物医学工程探索课程节选