Managed connection means that the application server manages the lifecycle of the connection (3-tier model).
受管的连接意味着应用服务器控制管理着(三层模型)的生命周期。
The 3-tier architecture can increase Web application availability by implementing automatic failover among multiple Web and application servers.
通过在多个Web服务器和应用服务器之间实现自动故障转移，3层架构可以提高Web应用程序的可用性。
Three buttons on this application are designed to access a mid-tier REST service, which you will develop in Part 3.
这个应用程序中的三个按钮访问一个中间层REST服务，我们将在第3部分中开发这个服务。
It also introduces 3 tier application design and how to test these designs.
它还介绍了三层应用程序设计，以及如何测试这些设计。
It also introduces 3 tier application design and how to test these designs.
它还介绍了三层应用程序设计，以及如何测试这些设计。
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