我相信，你们在物理课上都学过光是如何以微观的方式运动的，以及只有在光的波长在特定的范围内时我们才能看到光这一事实。

I am sure you all know from physics class about how light moves in microscopic ways and that we can only see light when the wavelength of that light is in a specific range.

youdao

我们在物理课上学过，记得吗？

We covered this in physics, remember?

youdao

是的。大一那年，我在物理课上遇到了很多难题。

Yes, I have. Freshman year, I was having a lot of trouble in my Physics class, and.

youdao

I've been here in MIT for thirty years, and in the early nineties I taught the large freshmen physics course, and electromagnetism.

我麻省理工工作三十年了，在上世纪九十年代初,我就开始给大一新生上物理课，以及电磁学。

麻省理工公开课 - 媒体、教育、市场课程节选

Yes, I have. Freshman year, I was having a lot of trouble in my Physics class, and

是的。大一那年，我在物理课上遇到了很多难题，

与教授的面谈 - SpeakingMax英语口语达人