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Nowadays many application system adopt the method of Multi-Tier architecture.
目前，越来越多的系统开始采用多层体系结构的方法。
youdao
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Distributed multi-tier application design library management system.
设计出分布式多层应用的图书馆管理系统。
youdao
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Distributed multi-tier application design library management system.
设计出分布式多层应用的图书馆管理系统。
youdao