他们的运算结果是相同的，但是第一个代码片断要比其他片断运行的要快。

The results will be identical, but the first code segment will run faster than others.

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结果，早期开发者醉心于使用代码维护他们的运算法则，但对用户界面却关注甚少。

As a result, early developers devoted as much code as possible to running their core algorithms efficiently and gave little thought to user interface.

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运算很简单，但前提是记下代码，否则无法完整地在头脑中使用这种方法。

The math is pretty easy, but unless you memorize the codes, you won't be able to perform the entire technique in your head.

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