此方法返回强类型化的Catalog响应模板实例。
The method returns a strongly typed catalog response template instance. In addition, the method now takes in two request parameters.
并不需要对其进行强类型化，因为它仅用于告知服务实现响应中所需的元素。
This does not need to be strongly typed as it only serves to inform the service implementation about what elements are needed in the response.
从第42行的ClientsBuilder开始，我们现在几乎拥有500行强类型化代码。
From the 42-line ClientsBuilder, we now have almost 500 lines of strongly typed code.
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