Another class of pattern covers interactions between two tiers.
另一类模式涵盖两个层次间的交互。
The Passenger equipment Safety Standards presently describe only two tiers of equipment.
现有的《客运设备安全标准》只规定了两级设备标准。
Let's call the two tiers app-tier (the application tier) and lb-tier (the load balancer tier).
我们把这两层命名为app -tier(应用程序层)和lb -tier(负载平衡器层)。
Between 1994 and 2006, for example, the number of institutions in Barron's top two tiers ballooned to 472 from 399.
比如，1994年到2006年间，巴朗前两等的学校数量从399激增到472。
Machine hall consists of two tiers: on the upper one there are generators and turbines, on the lower - pumps and pipelines. It is quite hot in the hall and rather noisy.
机械大厅由两层组成：上一层是发电机和汽轮机，下层是泵和管道。大厅内异常闷热嘈杂。
The two tiers exchange values, objects, and collections of concrete data.
这两个层交换值、对象和具体数据的集合。
We constructed two tiers of defence works. When the enemy attacked, we got into the tunnels.
我们挖两层工事，敌人攻上来，我们就进地道。
Integrated logistics information system is divided two tiers as micro (enterprise) and macro (region) to be built.
将综合物流信息系统分为微观(企业)和宏观(区域)两个层次构建。
For example, the data tier and the application tier might be located on the same machine in one topology, whereas the two tiers are located on separate machines in the other topology.
例如，在一个拓扑中数据层和应用层可能位于同一计算机上，而这两层在另一个拓扑中位于不同的计算机上。
For example, the data tier and the application tier might be located on the same machine in one topology, whereas the two tiers are located on separate machines in the other topology.
例如，在一个拓扑中数据层和应用层可能位于同一计算机上，而这两层在另一个拓扑中位于不同的计算机上。
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