From a modeling point of view, there are many different kinds of relationships that could be interesting: ownership, directed relationships, associations, and so on.
从一个建模的观点来看，有许多不同种类的关系十分有趣：所有关系，直接的关系，联合，等等。
Generally, technical people who understand UML and use-case modeling have trouble looking at a use case from the user point of view.
通常情况下，理解UML和用例建模的技术人员在从用户的角度看用例时都会有麻烦。
Option 1: From a process modeling point of view, human activities are steps in a business process similar to automated activities in the services layer.
选项1：从流程建模的角度而言，业务流程中的人工活动是与服务层中的自动化活动类似的步骤。
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