具体类型上，自然包括象征型自然、事实型自然、想象型自然和理想型自然四类。

On the entirety classification, nature consists of the emblem nature, the real nature, the vision nature and the ideal nature.

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然而，使用瀑布型开发方法的执行与想象是相反的：很多设计团队把在阶段1之后的修改设计视为他们的最初设计或者需求过程的失败。

However, that runs counter to the thinking behind the waterfall approach: Many design teams would view modifying the design after Stage 1 as a failure of their initial design or requirements process.

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例如，想象您正在建立一个数据密集型的系统。

For example, imagine you're building a system that's data intensive.

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We can certainly think about the forms, but if they're non-physical they can't be grasped by something physical like the body.

我们当然能想象型相,但假如他们是非现实的,他们将不能被现实的事物,比如肉体,所认知

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