The three levels model based on J2EE platform is introduced, of which more emphasis on design and realization of the navigating engine is given.
介绍了基于J2EE平台的三层模型设计，并注重研究了导航引擎的设计与实现。
Although it had incorporated just three years earlier, in late 1998, its eponymous search engine was already widely viewed as the best tool available for navigating the net.
虽然它的股份创办只有区区的三年时间，从1998年年底开始，与其公司同名的搜索引擎被普遍认为是最好的上网工具。
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