Congressman Boehner of Ohio. "If we abandon Afghanistan, it will return to a safe haven for the Taliban and al-Qaida to plan and execute more attacks on Americans,"

VOA: standard.2009.09.28

Let's see if we can actually execute it.

看看我们自己能不能把它演奏出来

耶鲁公开课 - 聆听音乐课程节选

We're just going to go through it and execute it a little bit. And then we'll move on and talk about how we'd actually make some of these measurements of delta H and compare

对吧？我们会讲完它并,实际应用一下，然后我们会,继续讲一下实际上我们,是怎样测量△H并与

麻省理工公开课 - 热力学与动力学课程节选

What that means, in a stored-program computer, is that I can provide to the computer a sequence of instructions describing the process I want it to execute.

它的意思就是说，我可以给一个存储程序计算机,提供一系列,描述我希望,能执行的过程的指令。

麻省理工公开课 - 计算机科学及编程导论课程节选

So conceptually the key difference here, besides the syntax looking slightly different, it just means that if you want a chunk of code to execute no matter what initially, ; you can use the do while loop; if you want to check a condition first, you can use the while loop.

所以概念上，则关键的区别是，除了语法看起来有点不同，它的意思是如果你想要一段代码,最初无论如何都要执行，你就可以用do，while循环;,如果你想要先检查条件，你可以用while循环。

哈佛公开课 - 计算机科学课程节选

All right, so now let's see how we execute it, and do the calculations that allow us to calculate this. So, one, what's delta H in step one?

好，现在我们看看怎样操作它，怎样进行计算，第一步,步骤I的ΔH是多少？

麻省理工公开课 - 热力学与动力学课程节选

If it does, then execute each of the instructions in that block.

这块代码内的,每一个指令。

麻省理工公开课 - 计算机科学及编程导论课程节选

If it is true, execute the sequence of instructions.

如果是的话，执行这一块的指令。

麻省理工公开课 - 计算机科学及编程导论课程节选

And what it's saying semantically is, using that variable as my placeholder, have it walk through this collection, starting at the first thing, execute that code, then the next thing, execute that code, and so on.

它的语义意思就是，把这个变量应用为我的占位符，用它来遍历这个集合，从第一个元素开始，执行代码，然后下一个元素，再执行代码。

麻省理工公开课 - 计算机科学及编程导论课程节选

So the question was, why is this return down at this level, it says, well if I ever execute out of this FOR loop, I get to the end of the FOR loop without hitting that branch that took me through the return, then and only then do I want to actually say, gee, I got to this place, there isn't any value to return, none I'm going to return none and none.

问题是，为什么它是在这个级别上返回值呢，意思就是如果我出了这个for循环,就意味着我运行的过程中没有走到任何,带return的支路上去,这时也只有这时我才能说天呐,我终于走到这儿了，这时不会返回任何值，只会返回none和。

麻省理工公开课 - 计算机科学及编程导论课程节选