They explain the Don't Repeat Yourself (DRY) principle: If you have the same information in more than one place, it will get out of sync, and you no longer can trust any particular instance of it.

他们阐述了“不要重复自己”(Don ' t Repeat Yourself, DRY)的原则：如果您将同一信息存放在多个地方，它将失去同步，并且您不会再信任它的任何特定实例。

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