分布式多层架构是目前企业构建大型应用系统所首选的结构，开发分布式多层架构的焦点集中在中间层。
The distributive multi-layer architecture is now considered an optimum choice by companies structuring large-scale systems and its development focuses on the middle layer.
软件体系结构设计是研究与开发软件的重要内容，中间件是大型分布式应用的软件体系结构的关键成分。
The design of software architecture is the important contents of software research and development. The middleware is the key component of software architecture of large distributed applications.
三明治夹层式面板结构，中间加阻燃隔热降噪材料，具有A 0级防火性能。
Sandwich type panel structure, the middle of flame retardant and heat insulation and noise reduction material, has the fire performance of A0 class.
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