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.
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.
旋度是下周的内容，你们习惯这个记号就行了，你们可能已经在物理课上用到过了。
Curl will be for next week. Just getting you used to the notation, especially since you might be using it in physics already.
旋度是下周的内容，你们习惯这个记号就行了，你们可能已经在物理课上用到过了。
Curl will be for next week. Just getting you used to the notation, especially since you might be using it in physics already.
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