在序列图上一个序列接收和发送消息(又称交互)，能通过连接消息和框架元件边界，建立模型(如图2所见到)。
On sequence diagrams incoming and outgoing messages (A.K.A. interactions) for a sequence can be modeled by connecting the messages to the border of the frame element (as seen in Figure 2).
当为图提供图形化边界时，一个框架元件为图的标签提供一致的位置。
A frame element provides a consistent place for a diagram's label, while providing a graphical boundary for the diagram.
除了提供一个图形化边框之外，用于图中的框架元件也有描述交互的重要的功能，例如序列图。
In addition to providing a visual border, the frame element also has an important functional use in diagrams depicting interactions, such as the sequence diagram.
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