版本化追踪并控制所有的变更作为模型连续的序列，或者版本。
Versioning: Tracking and controlling all changes as successive generations, or versions, of the models.
通过早期和连续的反馈，我们了解了如何改进应用程序，而迭代的方法为我们提供了逐渐实现这些变更的机会。
Through early and continuous feedback, we learn how to improve the application, and the iterative approach provides us with the opportunity to implement those changes incrementally.
与此相对比，迭代和增量式方法使得连续的变更更加容易，迭代会得出更好的解决方案。
An iterative and incremental methodology, by contrast, facilitates continuous change, iterating toward a better solution.
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