序列：序列接口用于需要在跨数据对象的属性进行排序时操纵数据对象（数据对象被称为一个排序类型）。

Sequence: The sequence interface is used to manipulate data objects when ordering across a data object's properties is required (the data object is said to be a sequenced type).

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在开发接口定义时，会大量使用序列。

You will use sequences a great deal in developing your interface definitions.

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当用户请求命令（应用功能）时，序列通过与用户接口对象相互作用来被执行。

The sequence starts when a user requests a command (an application function) to be executed by interacting with a user interface object, in this case the main form of the application.

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