下面是一些建议的设计方法，它们能够确保应用程序易于修改并且随需应变。

Here are some suggested design methods that can help ensure that your applications are easily modified and adapt well to growth.

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我强烈建议您在考虑用我所建议的方法修改一个正式的系统之前，先去修改一个无关紧要的测试系统。

I would highly recommend that before you consider modifying a production system in the ways I suggest, use a test system that you can afford to trash.

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清单9给出稍加修改的pop方法，强烈建议使用基于while循环的pop版本。

Listing 9 shows the slightly modified version of the pop method, and it is strongly recommended that you use the while loop-based version of pop .

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