考虑一下在活动图中使用一个业务进程图，来可视化地描述一个更加复杂的用例。考虑一下使用简单或者复杂的业务进程图。
Consider using a business process diagram in place of an activity diagram to visually describe a more complex use case.
本文描述的示例非常简单，但是很容易进行扩展以包括更加复杂的场景和策略。
The example described here is very basic, but can easily be extended to cover more complex scenarios and policies.
使设计计算结果更精确。 该方法简单易行，可对叶栅系统的空间结构进行更加详细的描述。
This method can be used to make the calculation easier and more accurate and give a mucll detailed description of the spatial structure of the cascade system.
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