任何大面积流行的公共代码库或多或少都会被认为是不可变的。
Any widely public library can be considered more or less unchangeable.
工作在公共代码之上的开发人员经常会打断开发过程中其他的软件部分的工作。
Developers working on common code frequently broke other pieces of software in the process.
在与本文相关的解决方案中，您将看到每个操作的公共代码都被移到了抽象超类中。
In the solution associated with this article, you'll see that the common code for each of the actions has been moved to an abstract superclass.
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