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To be systematic, I'm going to build this tree depth-first left-first.
为了保持系统性，我将要把这棵树设置,为深度优先和左边优先。
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All right. So, let's pick up where we left off, first of all we're still on the hydrogen atom from Monday.
好，让我们从上次停下的地方讲起，我们还要讲周一讲的氢原子。
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OK, so w, first of all, work is being done to the system on the left hand side here.
好的，首先,我们通过左边对系统做功。
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Just looking at this first line: "When I see birches bend to left and right."
看第一句：,当我看到白桦树弯下身子，向左，也向右“
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It says, well I'm going to print out first and last just so you can see it, and then I say, gee 2 if last minus first is less than 2, that is, if there's no more than two elements left in the list, then I can just check those two elements and return the answer.
然后它计算了尾点和开始点的差,如果小于2的话,也就是说数组中的元素小于等于，我对这两个元素进行比较,然后返回结果就可以了，否则的话，我们就去寻找中值点，注意它是怎么实现的,首先这个指向一个列表的开头。
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Now, who, first of all, who were the communards, who were the people that was left?
那么那些公社的社员又是些什么人呢,这些留下来的人是谁呢
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I'm sorting the right half which means sort the left half first, alright?
我对整个右半部分排序,这意味着要先对其左半部分排序，对吗？
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Let's create a graph here that on the x axis it's going to be time, so time zero will be when you first take in a food and then one hour later, two hours later will be shown as you go from left to right, and then we'll have blood glucose level up on the y axis.
我们在这建立一个曲线图,X轴代表的是时间,所以零时间点是你第一次进食的时间,然后一小时以后,两小时以后,是从左到右呈现在图表上的,在Y轴上是你的血糖值
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So, you can imagine, that we'll actually probably have a lot of kinetic energy left over if we put a lot of energy in in the first place.
因此，可以想象，如果我们一开始,就注入大量的能量,那么得到的动能也应该很大。
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All right, so where we left off with the photoelectric effect was when we first introduced the effect, we were talking about it in terms of frequencies.
好，我们刚才停止光电效应这个话题,是当我们第一次用频率，来讨论这个效应的时候。
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So let's first look at the left hand side.
所以首先让我们看看左手这边。
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Well, first I have to sort the left half of these elements.
首先，需要对这些元素的左半部分进行排序。
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