现有这样一款产品运行于两层环境，而且用户也很多。
A successful product, running in a two-tier environment, has many customers.
在这种模型中，访客操作系统在hypervisor之上的一层中运行。
In this model, guest operating system run on another layer above the hypervisor.
在运行过程中，它还会与数据访问层进行交互。
In the process, it also interacts with the data access layer.
路由器在整个网络模型的网络层运行，比以太网高了一级。
Routers operate at the network layer in the network model, one step above Ethernet.
管理层有这样的想法，质量系统应该可以运行得很好。
Expanding your quality management system into a business management system.
发生故障的电梯在运输中心的主层和低层之间运行。
The elevator takes people between the transit center's main floor and lower floor.
发生故障的电梯在运输中心的主层和低层之间运行。
The elevator takes people between the transit center's main floor and lower floor.
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