虚拟化给与云管理员通过更少系统处理更多请求的能力。
Virtualization gives cloud administrators the ability to handle more requests with fewer systems.
不同信任级别的群体访问这些服务：用户、租用者和云管理员。
They are accessed by parties of different trust levels: users, tenants, and cloud administrators.
如果资源可用，则可马上提交请求并自动路由到云管理员以审批。
If resources are available, the request can be immediately submitted and automatically routed to the cloud administrator for approval.
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