Now, let's look at how Rails migration can facilitate the database schema evolution.
现在，让我们看看Rails迁移如何为数据库模式变更提供帮助。
The Rails migration feature helps application developers manage this schema evolution, making it easy to synchronize changes between the application code and the database objects.
Rails迁移特性可以帮助应用程序开发人员管理这种模式演变，便于在应用程序代码与数据库对象之间同步更改。
Furthermore, the applications on top of the database and its users still need to interact with it regardless of its schema evolution.
另外，数据库之上的应用程序及其用户仍然需要和其交互，不论模式如何变化。
Rails migration does the job of the majority of the database administrative tasks associated with schema evolution.
通过Rails迁移完成模式变更这一主要的数据库管理任务。
Allows CREATE and DROP of arbitrary database objects, in conjunction with Hibernate's schema evolution tools, to provide the ability to fully define a user schema within the Hibernate mapping files.
帮助CREATE和DROP任意数据库对象，与Hibernate的sche ma交互工具组合起来，可以提供在Hibernate映射文件中完全定义用户schema的能力。
Allows CREATE and DROP of arbitrary database objects, in conjunction with Hibernate's schema evolution tools, to provide the ability to fully define a user schema within the Hibernate mapping files.
帮助CREATE和DROP任意数据库对象，与Hibernate的sche ma交互工具组合起来，可以提供在Hibernate映射文件中完全定义用户schema的能力。
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