An actor is any end user, organization, or system that interacts with, but is external to, your application.

参与者可以是与应用程序交互、在应用程序外部的任何最终用户、组织或系统。

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For instance, an application might have a Web-based HTML front end for external customers, and a more complete Java application front end for internal users.

例如，一个应用可能会有供外部客户访问的基于web的HTML前端，以及供内部人员使用的更完整的应用前端。

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For example an application may support both requester and provider role in different end to end interactions or external security services may support one or more of the functions listed.

例如，应用程序可能在不同的端到端交互中同时支持请求方和提供者角色，或者外部安全服务可能支持所列出的一个或多个功能。

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