Each rule set contains built-in methods for creating and copying business objects.

每个规则集都包含用于创建和复制业务对象的内置方法。

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Most schema manipulations, such as adding and removing columns, can be done using Rails's built-in methods.

大多数的模式操作，比如添加和删除列，都可以使用Rails的内置方法完成。

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The method executes the code block using the instance_eval method, one of the built-in methods in Ruby.

使用instance_eval方法可使该方法执行代码块，这是Ruby中的内置方法之一。

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