2.4 Complexity is incremental 复杂度是递增的

Complexity isn’t caused by a single catastrophic error; it accumulates in lots of small chunks. A single dependency or obscurity, by itself, is unlikely to affect significantly the maintainability of a software system. Complexity comes about because hundreds or thousands of small dependencies and obscurities build up over time. Eventually, there are so many of these small issues that every possible change to the system is affected by several of them.

复杂性不是由单个灾难性错误引起的；它堆积成许多小块。单个依赖项或模糊性本身不太可能显着影响软件系统的可维护性。之所以会出现复杂性，是因为随着时间的流逝，成千上万的小依赖性和模糊性逐渐形成。最终，这些小问题太多了，以至于对系统的每次可能更改都会受到其中几个问题的影响。

The incremental nature of complexity makes it hard to control. It’s easy to convince yourself that a little bit of complexity introduced by your current change is no big deal. However, if every developer takes this approach for every change, complexity accumulates rapidly. Once complexity has accumulated, it is hard to eliminate, since fixing a single dependency or obscurity will not, by itself, make a big difference. In order to slow the growth of complexity, you must adopt a “zero tolerance” philosophy, as discussed in Chapter 3.

复杂性的增量性质使其难以控制。可以很容易地说服自己，当前更改所带来的一点点复杂性没什么大不了的。但是，如果每个开发人员对每种更改都采用这种方法，那么复杂性就会迅速累积。一旦积累了复杂性，就很难消除它，因为修复单个依赖项或模糊性本身不会产生很大的变化。为了减缓复杂性的增长，您必须采用第 3 章中讨论的“零容忍”理念。