The system login uses information such as source ID (SID), domain and system user name for authentication, so it is considered secure.

系统登录会使用到诸如源 ID（安全识别符），域和系统用户名等信息进行身份验证，因此被认为是安全的。

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If local system users were to run the services, the password would need to be changed in every machine instead of just once for the user in the domain controller.

如果本地系统用户要运行服务，则需要在每台机器中修改密码，而不是只在域控制器中为该用户修改一次。

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User client system to join the domain.

加入域的用户客户端系统。

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