With the PAM framework, multiple authentication technologies can be added without changing any of the login services, thereby preserving existing system environments.
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。
PAM framework provides support to integrate multiple authentication mechanisms to existing authentication mechanism.
PAM 框架支持将多个验证机制集成到现有的验证机制中。
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