RDA can be used to develop data models in either a top-down or bottom up manner, allowing analysis of existing databases and development of data models by reverse engineering of existing data assets.

RDA可用于采取自下而上或自上而下的方式开发数据模型，允许分析已有数据库和通过对已有数据资产的反向工程开发数据模型。

youdao

Because I've explored the object in a bottom-up fashion so far in this article, I now look at the reverse from the user perspective (see Figure 7).

到目前为止，我都是以一种自下而上的方式探索对象，现在我们采用自上而下方式，从用户透视图中考察对象(见图7)。

youdao

The data model may be developed top-down solely based on business requirements or bottom-up through reverse engineering of existing data structures.

数据模型可以采取自上而下的方法根据业务需求单独开发，也可以采取自下而上的方法通过对已有数据结构进行反向工程来开发。

youdao

With FNSR I do see a bit of a reverse Head and Shoulders bottom here.

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