一般情况下，可以将RBAC视为指定某些角色下的用户接收的访问。

You generally think of RBAC as specifying the access that users in certain roles may receive.

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这意味着他们控制用户密码的创建，以及为对系统资产的一般访问等基本功能制定规则和过程。

This means sitting on top of the creation of user passwords and the formulation of rules and procedures for such fundamental functionality as general access to the system assets.

youdao

一般来说，如果两个或多个用户以写模式并发访问文件，第一个用户保证能以写模式访问文件，其他用户的写模式访问请求将排队。

In general, if two or more users access the file in write mode concurrently, the first user is granted write mode access to the file and the remaining users write mode access requests are queued.

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