The header note for the diagram indicates it is an alternate course of action.
该图的标题注明了这是一个备选行动过程。
Also notice how the ID of this diagram indicates that this is alternate course B.
另外还请注意该图的标识是如何表示这是一个备选过程B。
The logic of a usage scenario may be part of a use case, perhaps an alternate course.
使用方案的逻辑可以是用例的一部分，可能是备选过程。
Start with the happy path, the basic course of action — but don't forget the alternate courses as well.
如果一切顺利，使用的将是基本行动过程——但也不要忘记备选过程。
The most common way to do this is to create a single sequence diagram for each alternate course, an example of which is depicted in Figure 1.
最常见的方法是对每个备选过程创建单一的序列图，如图1所示。
This diagram models only the logic of a single alternate course, as you can tell by the numbering of the steps on the left side of the diagram.
该图只对单个备选行动过程的逻辑建模，这可以通过序列图左侧所列的步骤编号得知。
The sequence diagram of Figure 1 is simpler than that for the basic course of action because the logic of an alternate course is typically simpler.
图1的序列图要比基本行动过程的序列图简单，因为备选过程的逻辑通常更简单些。
In order to get to a pragmatic course of action like working on alternate career paths, you may need to release some anger.
为了采取务实的行动，例如，去寻找其它职业路线，那么你也许需要释放一些愤怒。
This course is offered alternate years.
此课程隔年开课。
This course is offered alternate years.
此课程隔年开课。
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