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This is the place where people typically slip up in debugging. They don't think in advance what they expect the result to be.
实验就推翻了你的假设了,人们在做调试的时候往往忽略了这一点,他们做实验之前并没有想想。
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The two best debugging tools are the same now that they have almost always been.
最好的两个调试工具一直,以来基本没怎么变过。
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But just so you've been teased with them, "-ggdb" is a flag that's going to enable what are going to be called "debugging symbols."
但是你们刚才被他们忽悠了，“-ggdb“是用来使能“调试标志“功能,的一个标记“
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See if we can find it here. And notice, by the way, that I commented out the previous debugging line, rather than got rid of it.
我们再去从它们的中间开始尝试，看看我们能不能发现问题源,顺便说一下，请注意。
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I emphasize this because it often leads to a different debugging strategy.
因为这会导致不同的调试策略,所以我要强调这一点。
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So one of the things I want you to notice here is that testing and debugging are not the same thing. When we test, we compare an input output pair to a specification.
这里我想大家注意的一件事,就是测试和调试是不同的两件事情,我们测试的时候，我们把输入输出,跟程序的规格说明书对比下。
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Does it give you the answer that you expected it to give? Often, in practical problems, you'll spend just as much time doing performance debugging. Why is it slow?
它返回了期待中的结果了么？通常,在实际的问题中你会花，同样多的时间在性能调试上,它为什么运行这么慢？
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And I've put it in my debugging code.
调试的代码中去，然后运行看看结果。
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Patience is an important part of the debugging process. I have not rushed.
耐心是调试过程中的一个重要部分,我没有着急，我冷静的慢慢的。
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There's a lecture I've given several times at hospitals, to doctors, on doing diagnosis of complex multi illnesses. And I go through it and almost the same kind of stuff I'm going to talk to you about, about debugging.
一个实验室内的实验，为什么实验不对呢？,我也在医院给医生关于,诊断复杂的多种疾病做过很多讲座,我想了想，那和我给你们讲的,关于调试其实都是一回事。
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So a word about debugging.
关于调试我们来说几句。
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They didn't apparently call it debugging.
在编号70的传送带那。
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That gets us to debugging.
这就需要我们去调试了。
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Typically, even though they don't breed, there are many bugs. And keep in mind that the bug goal of debugging is not to eliminate one bug.
这是件好事，其实即使bugs不会繁殖，也会有很多，并且请记住调试的目的,并不是去消除一个。
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