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).
请注意，可以启动包含调用-接收序列的多个事件处理程序实例来处理此场景。
Please note that it would not be possible to start multiple event handler instances that contain an invoke-receive sequence to deal with this scenario.
序列用于维护发送和接收的消息的状态。
The sequence is used to maintain the state of messages that have been sent and received.
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