请长话短说!
Thank you! Thank you for Principal Xu, all the teachers and most importantly, the class of 2019. If I can't make my speech fantastic, I will at least try to make it short.
谢谢你!感谢徐校长,感谢所有的老师,最重要的是,感谢2019级的同学们。如果我不能把我的演讲讲得精彩,我至少会试着把它讲得简短些。
我想把它长话短说吧。
So it's a short problem set, but make sure you know how to do those problems.
因此这是个小问题集,但是确保你懂怎么解决这些问题。
if you don't want to use that, you can also derive it as we did every time, it should intuitively make sense how we got there. But the exams are pretty short, so we don't want you doing that every time, so we'll save the 2 minutes and give you the equations directly, but it's still important to know how to use them.
吸收的和发射的,如果你不想用公式,你也可以每次都向我们这样推导它,很直观的就能得到结果,但考试时间很短,我们不希望你们每次都推导,所以我们会直告诉你,让你节省2分钟,但知道如何应用它十分重要。
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