The only caveat is that our target class happened to be intercepting filter itself.
唯一要告诫的是我们的目标类本身恰恰就是拦截过滤器。
A filter is provided on both the source and target columns to make finding such fields easier.
源和目标列中都提供了一个过滤器，可以使字段的查找变得非常容易。
A filter expression is created in the warehouse target model which will use the default value (if provided).
在仓库目标模型中创建一个过滤器表达式，这将用到默认值(如有提供)。
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