The system is a distributed network application with multiple-tier architecture.
该系统是一个多层体系结构下的分布式网络应用。
You can apply it to one tier in an architecture and to multiple tiers across the enterprise architecture.
你可以在架构中的一层上应用它，也可以在贯穿企业架构的多个层上来应用它。
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。
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