这段代码较多，但是如果您把它理解成是将三个不同页面集合在一个页面，就会相对比较好理解。
This is a lot of code but if you think about it as three different pages all in one page, it's a little easier to follow.
因为在那个阶段的没有其它的代码了，这个程序将以一种比较好的方式自然地退出，请说？
And because there's nothing else in the code at that point, the program should just quit naturally in a good way. Yeah?
它们对代码有比较好的控制并抽象开底层技术。
They keep a better control of code and abstract away the underlying technologies.
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