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So you might ask well, why are we using this model if it clearly doesn't take into account quantum mechanics?
那么大家可能会问为什么我们要用这个,显然没有考虑量子力学的模型呢？
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So that happens like you're asking an American "Why is this article?"
所以你问一个美国人“为什么要用这个冠词？”
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The question was, if you didn't hear, why do I have two equal signs?
这个问题是，如果你没听到问题的话，我为什么要用两个等号呢？
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So I'm really just interested in how filmmakers make films for what motive they have in common, why they make them and how they choose to present reality.
所以我对电影制作者们,在制作电影时有没有什么共同的动机,他们为什么要制作电影，如何用电影反映现实,等方面很感兴趣。
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Why do you like to measure angle in the peculiar way?
为什么要用这种特殊的方式衡量一个角呢
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And I use the term photon here, and that's because he also concluded that light must be made up of these energy packets, and each packet has that h, that Planck's constant's worth of energy in it, so that's why you have to multiply Planck's constant times the frequency.
我这里用光子这个词,是因为他还总结出光,必须由这些能量包组成，每个能量,包有这个h，普朗克常数代表,里面的能量，所以这就是为什么你们,要用普朗克常数乘以频率。
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We've talked about why we use the pop music.
我们也讨论了我们为什么要用流行乐举例。
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And the reason I want to use this as an example is, here's my little definition of segment.
我为什么要用这个,做为这个例子的原因是，这是我对于segment的一个小定义。
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But now, hopefully, we understand where that comes from, why it is that we use the shorthand notation.
但是现在希望我们明白,那是从哪来的，我们为什么要用简化形式。
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Why would I want to use this?
为什么要用它呢？
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