能够轻易地识别关键代码是重中之重。

Being able to easily identify the critical pieces of code can prove to be very valuable.

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将精力主要放在关键代码路径的改进上。

Focus on improving the critical code path.

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可以通过字符串来定位关键代码。

Through the string to locate the key code.

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But there's a key line of code that I lost over a moment ago and that was this one here.

但是我刚才漏了一行关键的代码,就是这里的这一行。

哈佛公开课 - 计算机科学课程节选

We could certainly implement this much more efficiently by just writing this one line of code, but, again, the key here is to take this step toward decomposing our code into chunks of code.

我们可以写这一行代码,使代码的执行更有效率，但是，这个关键字用来把我们的代码分解,成一段段的。

哈佛公开课 - 计算机科学课程节选