这些小的代码段也更容易维护。
Those small sections of code also become easier to maintain.
单个人确实没必要用私人打印机。通常，一台大容量网络打印机比一大群的个人打印机价格上更便宜，速度更快，也更容易维护。
None of the individuals really needs a private printer, and a high-volume networked printer is often cheaper, faster, and easier to maintain than a large collection of individual printers.
如果一个模块更改只影响它的内部包，对它的外部包没有任何影响，那么可以只对一个单独的隔离模块进行维护，测试目标也更容易确定。
If a change to a module affects only its internals, with no impact to its external contract, then maintenance can be applied to a single isolated module and testing can be better targeted.
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