Each activity represents something that must be done by someone or something.
每个活动表示必须由某人或某物完成的某事。
A business actor represents a role played in relation to the business by someone or something in the business environment.
业务角色代表业务中的一个或一组角色。参与业务用例实现时，一个业务角色和其他角色进行交互，并操纵业务实体。
A business actor represents a role played in relation to the business by someone or something in the business environment.
业务角色代表业务中的一个或一组角色。参与业务用例实现时，一个业务角色和其他角色进行交互，并操纵业务实体。
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