当出现故障时，通过一个命令将备用系统的角色切换为主系统的角色。

In the event of a failure, the standby's role can be switched to primary with a single command.

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每个人都应该经常切换角色。

Each person should switch roles frequently.

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它们动态地将其角色从内部切换到外部，或反之亦然，以响应使用服务的资源和活动的组织控制更改。

They dynamically switch their role from internal to external, and vice versa, in response to changes in the organizational control of resources and activities of consumption service.

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