为了满足新的需求，设计也在不断演化，关键对象承担着各种模式角色，直到它们变得难以使用或者难以修改，最终不得不重构或者重写系统。
As the design evolves to meet new needs, key objects are loaded with pattern roles until they become hard to use or hard to change and the system has to be refactored or rewritten.
如果出于不得已的原因需要为很多程序添加某个路径，那么也可以修改系统的默认搜索路径。
If you have a compelling reason to add a path to many programs, you can also change the system's default search path.
这时候，整个项目不得不停止，强迫重写并不兼容的子系统，然后其他团队也被迫来趋附这些修改。
At that point, the whole project is stopped, an incompatible rewrite of a subsystem is forced, and then the other teams need to adapt to the change.
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