This means that the Industry Models tend to follow neither a top-down nor bottom-up approach.

这意味着行业模型趋向于既不遵守自顶向下，也不遵循自底向上的方法。

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Models predicted that electrical charge should be limited to the top and bottom of any ash plume, which is often the site of spectacular lightning.

根据以前的模型，电荷仅存在于火山灰羽状物的顶部和低端，那里时常发生华丽的闪电。

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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。

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