无线通信技术的飞速发展，人们在移动环境下对数据服务的需求量急剧增加。
With the development of wireless telecommunication technology, the demand of people for data services increased more and more.
在移动环境下，客户缓存为提高客户-服务器数据库系统的整体性能提供了有效途径。
Under mobile environments, client caching provides an effective way to improve client-server database system performance.
在移动环境中，这是极其低效率的，因为使用无线网络交换这种信息将花费大量的时间。
In a mobile environment, this is extremely inefficient because of the amount of time a wireless network would take to exchange this information.
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