当在后期应用资产1创建元素时，我们添加类型“类”的另一个模版参数，名为“ marshaller ”(图15和16)。

As the element will be created at a later stage, when we apply Asset 1, we add another template parameter called "marshaller" of type "class" (Figures 15 and 16).

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然后，我们将给新类添加必要的代码以支持它拥有“羽翼”这一特性。

Then, we could add the necessary code to our new class to support "wings."

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class选项允许我们指定向哪个类添加字段。

Class options let us specify which class we want to add fields to.

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