A generic type definition is not assignable from a closed constructed type.
泛型类型定义不可以从封闭构造的类型赋值。
If a nested type is generic, this method returns its generic type definition.
如果嵌套类型为泛型，则此方法返回其泛型类型定义。
Returns the field of the specified constructed generic type that corresponds to the specified field of the generic type definition.
传回指定之建构泛型型别的栏位，其对应于泛型型别定义的指定栏位。
At the heart of DITA, representing the generic building block of a topic-oriented information architecture, is an XML document type definition (DTD) called "the topic DTD."
DITA的核心是一个称为“主题DTD”的XML文档类型定义(DTD)，代表面向主题的信息体系结构的一般构造块。
But if ln were aliased with li, then it would break the type-safety promise implicit in the definition of li — that it is a list of integers, which is why generic types cannot be covariant.
但是如果ln是li的别名，那么这就破坏了蕴含在li定义中的类型安全承诺——它是一个整数列表，这就是泛型类型不能协变的原因。
But if ln were aliased with li, then it would break the type-safety promise implicit in the definition of li — that it is a list of integers, which is why generic types cannot be covariant.
但是如果ln是li的别名，那么这就破坏了蕴含在li定义中的类型安全承诺——它是一个整数列表，这就是泛型类型不能协变的原因。
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