为什么声明为模板实例化运行时多态导致链接器错误呢？
Why does declaring runtime polymorphism for template instantiations result in linker error?
另外一些情况下，可以利用关于类型的一些特殊知识，编写比从模板实例化来的函数更有效率的函数。
At other times, we may be able to take advantage of some specific knowledge about a type to write a more efficient function than the one that is instantiated from the template.
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.
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