Prepare for multiple scenarios and contingencies.
为各种情况和意外事件多做准备。
A generic sequence diagram can model an entire use case consisting of multiple scenarios.
常规序列图可以为包含多个方案的整个用例建模。
The solutions defined by each scenario are modular in nature and can be built on top of one another; elements of multiple scenarios can be used together to create a composite scenario.
每个场景定义的各种解决方案均具有模块化的性质,可以构建在另一个解决方案之上;多个场景的元素可以在一起使用以创建一个合成场景。
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