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OK, last day, you talked about the Born-Haber cycle, and octet stability via electron transfer.
言归正传，昨天我们讲的是伯恩哈勃循环，和8电子稳定结构。
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It's phosphate, carbon, carbon, carbon, phosphate, carbon, carbon, carbon, phosphate and it has this structure hanging off the side.
就是磷酸基与戊糖的碳反复连接,如此循环往复,这种结构构成了主链的一边
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Okay, not to dwell too much on math because you can very quickly bore someone in computer science by dwelling too much on math but it's useful even for logical constructs as we'll see with loops.
不要过于纠结于这些数学问题了,在计算机领域，你会很讨厌那些,在这上面钻牛角尖的人，但是对于那些,像循环这样的逻辑结构又是很有用的。
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The loop invariant what does the loop invariant mean? It says, here is a property that is true of this structure every time through the loop.
循环不变量是什么意思？,它是一个在结构体中,每次循环都为真的属性。
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The cookies were going back and forth and back and forth and the hearts up and down, well, this thing that we had that called a loop last week with a forever block with a statement inside of it is simply gonna look a little something like this.
这些饼干人来来回回的移动,还有这些爱心们上上下下地漂浮,都用到我们上周提到过的循环结构,当然还有个声明在里面，就有点像屏幕上,显示的这样。
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There are so many other constructs like loops and conditions and such, so what I thought we do in conclusion today is look at this program.
这里有很多其他结构类型如循环控制,条件分支等等，所以我觉得应该,以这个程序作为结束。
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And we have looping constructs.
我们还学习了循环结构。
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So the translation here is that whereas last week and in Scratch, the looping structures are yellow and have kind of this brace structure to them.
同理，大家回想一下上个星期,在Scratch软件中，循环结构都用黄色标记出来了,与此类似。
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The difference with the do while loop, as the syntax kind of suggests, is that this construct is going to do something no matter what.
作为建议的语法，do，while循环的不同之处,是这个结构不管怎么样,它会做一些事情。
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That is basically saying, given some collection of data, I want to have again a looping mechanism, where now my process is, walk through this, the collection one element at a time. And for that, we have a particular construct, called a FOR loop.
现在我的过程就是,通过一个个访问这个集合中,的元素的方式，来遍历这个集合,为了达到这个目的，我们有一个特定的结构，成为FOR循环。
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