So I am going to on the fly write a very simple little main program that just illustrates some of the syntax that we can then visualize more interesting.

我很快的写了一个很简单地小程序,来说明一些语法,我们使它变得更有趣些。

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Nonetheless, in the case of the Phaedo, I am going to spend more time actually saying, "Here's what I think the first main argument is.

对于斐多篇,我还会花更多的时间来说明诸如,我认为首要论证是这样的

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Well, for a thing called main which itself is a function but a function I wrote, a tool I am writing at the moment not like printf which someone else wrote long ago, I have to say where does main start, where does main end, and I do that by using these curly braces.

至于这个名曰main的函数,由我们自己写的函数，也是一个工具,只不过由我们自己编写，而不是像printf那样已经由前人写好了,我们必须要说明main在哪开始，在哪结束，这样我们就要用到大括号了。

哈佛公开课 - 计算机科学课程节选