We define an instance attribute for the required LangCode parameter.
我们为所要求的LangCode参数定义一个实例属性。
When an instance attribute is referenced that isn't a data attribute, its class is searched.
当引用一个非数据属性的实例属性时，就会搜索它的类。
When an instance attribute is referenced that isn't a data attribute, its class is searched.
引用非数据属性的实例属性时，会搜索它的类。
When an instance attribute is referenced that isn't a data attribute, its class is searched.
引用非数据属性的实例属性时，会搜索它的类。
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