Spatial databases are being applied widely in many applications such as GIS, CAD, Robot, Computation, Geometry, Computer Vision, Physic Image and Multimedia System etc.

空间数据库已广泛地应用于GIS, CAD、机器人、计算几何、计算机视觉、医学图像和多媒体系统等领域。

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Multimedia communication system as a hot research in area of communication applications, play an important role in industry, medical care, business and education.

多媒体通信系统在工业、医疗、商业和教育等各个方面发挥着重要作用，成为通信应用的研究热点之一。

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But with the development of applications, a growing class of distributed system requires real-time support, such as military command and control system, avionics system and multimedia system.

然而随着应用的深入，在许多分布式系统中，比如军事指挥系统、航空电子应用、多媒体系统等都提出了对实时的需求。

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