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问题：
[问答题]什么是可重用性？如何通过提高软件的可重用性来提高软件的可维护性？
参考答案：
可重用性是指同一事物不加修改或稍加修改，就可以在不同环境多次重复使用。大量使用可重用软件构件，可大幅提高软件的可维护性。主要体现在两个方面：
1.可重用构件通常都是组装成功的部件，加上每次重用又都会进一步完善部件，因此可以大幅提高软件的可靠性，而改正性维护要求会降低。
2.很容易修改可重用的软件构件，使之适应新的应用环境，因此软件中使用可重用构件越多，软件的适应性维护和完善性维护也越容易。
1.可重用构件通常都是组装成功的部件，加上每次重用又都会进一步完善部件，因此可以大幅提高软件的可靠性，而改正性维护要求会降低。
2.很容易修改可重用的软件构件，使之适应新的应用环境，因此软件中使用可重用构件越多，软件的适应性维护和完善性维护也越容易。
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