名词
中文翻译：有向集
同义词：
['directed set', 'directed system', 'directed graph']
例句：
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1. Incomputer science, a directed set is a collection of elements that can be ordered and have a specified direction.
在计算机科学中，有向集是一组可以排序且具有指定方向的元素。
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2. The directed set theory is used to model the structure of a directed graph.
有向集理论用于建模有向图的结构。
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3. In this example, we will use directed sets to represent the relationships between different parts of the system.
在这个例子中，我们将使用有向集来表示系统不同部分之间的关系。