对于Internet进行这样的搜索，其代价非常昂贵，Web内容与索引程序进行通信所需要的带宽以及对结果进行索引所需要的计算成本都很高。
Searching the Internet like this can be expensive, both in terms of the bandwidth required to communicate Web content to the indexer and also the computational expense of indexing the results.
通信网络时延受限且满足带宽要求的最小代价组播树问题是NP完全问题，传统方法难以求解，一般采用启发式方法求解。
The problem of minimum cost multicast tree satisfying bandwidth request and delay-constraint in communication network is a NP-complete problem. It is difficult to be solved by traditional methods.
下一代移动通信的目标是以最低的代价（带宽、功率、复杂度）为日益扩大的用户群提供更加可靠、高速的宽带数据业务。
The next generation mobile communication systems aim at providing higher quality and data rate transmission at the minimum lost (power, bandwidth or complexity ) in finite wireless resource.
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