Each migration, has an up and down method.

每个迁移都有up和down方法。

youdao

First, Steps 1-3a of the top-down method are used, primarily to produce the so-called DTOs (possibly based on standards-based XSDs).

首先，请遵循自顶向下方法中的步骤 1-3a，这主要是为了生成所谓的 DTO（可能根据基于标准的 XSD）。

youdao

This is different from the drill-down method because with zooming, the map is typically not rebuilt or reorganized for each level of magnification.

这种方法由于使用了缩放而不同于drill - down，对于每一个级别的放大操作，地图通常不用重建或重组。

youdao

Using a bottom-up approach to his research, as opposed to Mr McCullough's top-down method of looking at the project through a geopolitical prism, Mr Parker has written the Panama story for a new generation.

ECONOMIST: The Panama Canal

Some advised coming up with complex passwords and writing them down or some method based on that.

FORBES: Discussing Gawker's Breach With Founder Nick Denton

Guernsey's treasury minister said it was down to a new method of assessment.

BBC: Deputy Charles Parkinson