Defines a nested type, given its name.
已知名称和特性，定义嵌套类型。
A nested type is a type that is a member of some other type.
嵌套类型是作为某其他类型的成员的类型。
A nested type is a type declared within the scope of another type.
嵌套类型是在另一个类型的范围中声明的类型。
A nested type argument is a type argument that is also a generic type.
巢状型别引数就是也是泛型型别的型别引数。
Let's remove the: Int return type on the nested fact method.
让我们来删除嵌套的fact方法的：Int返回类型。
Product type nested to the right of Product line on the rows.
将Producttype嵌套到Rows的Productline的右边。
Simple, non-nested elements have a simple type.
简单的、非嵌套的元素是简单类型。
If a type has a wider purpose, it most likely should not be nested.
如果型别具有更广的用途，则很可能不应巢状化。
If a type has a wider purpose, it most likely should not be nested.
如果型别具有更广的用途，则很可能不应巢状化。
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