我们在前一节中添加了三列，这正是保持功能连续性的第一步。

We already started looking for functional continuity in the previous section by adding three columns.

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为了保持整洁和灵活，您可以使用一个单独的类来处理每个输出格式，每个类提供表1所列的功能。

To keep things neat and flexible, you can use a separate class to handle each output format, each of these providing the functionality listed in table 1.

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当进行少量更改时，例如添加或删除数据库列，该功能可以有效地减少数据库管理员对模式的修改操作。

This effectively reduces the need for database administrators to modify schemas when simple changes, such as the addition or removal of database columns, are performed.

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