型别扩充，可让您轻松扩充现有型别，而不需要额外建立新的衍生型别。
Type extensions, which enable you to extend an existing type easily without the additional overhead work of creating a new derived type.
建立与现有的事件描述项相同的新事件描述项，方法是以动态方式从一个型别上的指定事件产生描述项资讯。
Creates a new event descriptor that is identical to an existing event descriptor by dynamically generating descriptor information from a specified event on a type.
如果范围变数并非不变的型别，则只有当型别的所有成员都符合现有的查询结果时，查询才会忽略查询结果。
If the range variable is not an immutable type, the query will only ignore a query result if all members of the type match an existing query result.
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