Half of you did above average on the Midterm; half of you did below average on the Midterm, but if I went up and asked each of you why the answers would not be symmetrical.
你们当中有一半人期中考得比平均分高;,有一半期中考得比平均分低,但如果我去问你们为什么,答案会各有不同呢。
we start high and go low, we're dealing with emission where we have excess energy that the electron's giving off, and that energy is going to be equal the energy of the photon that is released and, of course, through our equations we know how to get from energy to frequency or to wavelength of the photon.
当我们从高到低时,我们说的,是发射,电子有多余的能量给出,这个能量等于,发出,光子的能量,当然我们可以通过方程,从能量知道,光子的频率,和波长。
And so these are the things people care about a lot and they're the ones that popular diet books are built around almost exclusively: that you should eat low fat, you should eat low carbs, high fat, they're all kinds of permutations of these that exist out there.
所以大量营养素是人们所关注的,它们也是,现在流行的饮食书籍所围绕的话题,类似人们应该吃的低脂或者应该低碳高脂,各种各样的说法都有
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