I figure they probably had to refuel and launch from one of these bases that's right on the border.
我想他们可能要从边界上的某个基地加油然后发射。
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).
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)。
That is why, in Figure 3, iteration T2 is translucent and has a dashed border.
这就是为什么,如图 3,迭代 T2 是半透明的,并且有一个虚边。
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