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And if that's true is everything in the string, starting at the first element and removing the last element, a palindrome?
如果是相同的话,是不是字符串中的所有从第一个元素开始,并且删除最后一个元素后？
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I've written a little for loop, which is going to iterate over all of the elements in the list.
让我们先看看这儿的代码，我已经写了一个循环语句,用来迭代处理数组中所有的元素。
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So, let's just take a quick example to show how not completely you can use these periodic trends, that there are limits.
那么，让我们举一个小例子来看一下,你是如何不能将元素周期律用在所有地方的，它是有局限性的。
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He has all the information he knows that has been reported on the various elements on file cards He even carried them around in his pocket and he would look at them from time to time and try to devise a scheme.
他将所有他知道的,已经研究出来的元素的信息放到文件卡片上,他将它们随身携带在口袋里,这样他就可以时不时地看它们了,并且试图设计出一个图表。
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Delta H of formation means the enthalpy of this compound minus the enthalpy of its constituent elements in their most stable state at room temperature and pressure.
生成焓就是这种组分,的焓减去它的所有组成元素,在室温和常压下处于,其最稳定的状态时的焓。
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And he actually did this in the late 1800's, back before even all of the elements that we know today were discovered, really only about 60% or so, 70% were discovered then that we now know today.
他最终在十九世纪晚期完成了这一壮举，难能可贵的是,虽然我们现在已经发现了所有的元素，但在当时已知的元素只有我们现在知道,百分之六七十，在这种情况下。
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At the end of the first round, I've got the smallest element at the front. At the end of the second round, I've got the smallest two elements at the front, in fact I got all of them sorted out. And it actually runs through the loop multiple times, making sure that it's in the right form.
看看发生了什么，在第一轮结束后,我把最小的元素移到了前面,第二轮结束后，我把最小的,两个元素移到了前面，实际上,所有的元素都排好序了,实际上，这个算法运行了几次循环，确认下这是正确的形式。
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The worst case here is, the things not in the list in which case I've got to go all the way through the list to get to the end.
目标数不在数组里,这意味着我必须遍历数组中所有的元素,好，说完了这些。
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SI units means everything goes in, in SI, everything comes out in SI.
国际单位制单位意味着所有元素进出，都是以国际单位制单位的形式。
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All atoms of an element are identical, that's good.
一种元素的所有原子都是相同的，非常好。
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And I can obviously do the other direction which is I can say skip to index 2 and all the remaining pieces. This lets me slice out, if you like, the front part or back part or a middle part of the tuple as I go along.
很明显我可以从索引2开始切片,所有剩下的元素，这可以让我2,如果你喜欢我这么说的话,取得元素的前面的或者后面的,或者中间的部分。
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So here, I'm going to have delta H, is just the sum for all the products of delta heat of formation right? Here I'm going to put together all the products. So this is a positive heat of formation.
所以这里△H就是所有生成物的,生成热的和,对吧？这里,我要把元素组合成所有这些,生成物，所以这里是正的生成热。
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Again I should have said first, index 0, the first one. I can similarly go in and say I'd like all the things between index 2 and index 4. And again, remember what a b c that does. Index 2 says start a 0. 1, 2. So a, b, c.
我还是要说一遍，索引为0的元素，是第一个元素，我可以要求返回索引,2和4之前的所有元素，请记住2,是从0开始的,那么0，1，2对应的是。
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So, for example, if I say TEST and I don't give it a start but I give it an end, then it gives me all the elements up to that point.
例如，我创建了TEST这个元组我没有给他,起始点却给了它一个结束点,然后程序会基于这一点放置所有的元素。
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