您可以将主题看作以不同方式准备食物的各种类型的容器，例如，最常用的平底锅、搅拌器和烘焙碟。

You might think of topics as types of containers for preparing food in different ways, such as a basic frying pan, blender, and baking dish.

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进行这种类型的迁移需要仔细的准备和计划。

Any migration of this type requires careful preparation and planning.

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第一种方法是为每一种类型的数据元素准备一个数据元素表。

The first approach would be to have one data element table for each type of data elements.

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