通过使用pam框架，可以添加多种认证技术，而不必更改任何登录服务，从而可以保留已有的系统环境。
With the PAM framework, multiple authentication technologies can be added without changing any of the login services, thereby preserving existing system environments.
“系统”表示程序自身，它关注表示程序改进的待办事宜条目，比如技术债务相关的条目、任何框架的升级等等。
"The system" represents the program itself, which would have a stake in backlog items representing program improvements such as technical debt items and the upgrading of any frameworks.
您将会看到，通过开发端到端的系统工作框架，在细化阶段如何处理技术风险。
You'll see how technical risk is addressed during the Elaboration phase by developing an end-to-end working skeleton of the system.
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