General Motors says it will lay off nearly 50,000 employees this year and that it plans to close five assembly plants, eliminate thousands of dealerships and reduce the number of its brands from eight to four - all in an effort to stay afloat.

VOA: standard.2009.03.30

Having that ability to close off a chapter and move on is really, really important.

结束一个章节,并且继续向前的能力非常重要。

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And they close off the square and just allow the public into certain bits of it

那时，他们会封闭广场，只允许公众去特定的区域，

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And they close off the streets,

到时候街道会被封锁，

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What is this? This is a wonderful piece of abstraction. It is saying, you don't need to know squat about what's inside the body of this function. You don't have to worry about the parameter names, because they're going to be preserved, you don't need to worry about how I'm doing it, this tells you how you can use this, in order to use it correctly. Of course, I can then close it off, and off we go.

但是这能告诉你一些信息,这是什么？,这是一段完美的抽象,它的意思是你不需要知道,这个函数的内部构造，你不必担心参数是否重名，因为它们已经被预存了,你不需要担心我如何使用它,它告诉了你你该如何操作，从而正确的使用它，当然我也可以把它关掉。

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