求翻译：而根据历史经验，搜索算法主要面临两方面的问题，一是搜索效率的问题；二是搜索产生的节点信息量问题。由于这两方面不可能同时达到最优，因此搜索算法的研究主要是在这两者之间找到最优关系。是什么意思？

Based on historical experience, the search algorithm is mainly faced with two issues, first, the search efficiency; node in the amount of information generated by the search. Since these two aspects can not be optimal, so the search algorithm to find the optimal relationship between these two.

Based on historical experience, and search algorithms are faced with two major problems, one is to search the efficiency issue; 2 is the node information search problems. Because the two areas that were not possible to optimize both, the search algorithm of the research is mainly between the two to

But acts according to the historical experience, the search algorithm mainly faces two aspects the questions, one is searches the efficiency the question; Two, the search produces node information content question.Because these two aspects are impossible simultaneously%2

Based on historical experience, faced two main problems search algorithm, is the problem of search efficiency; the second is search nodes of information issues. As these two cannot simultaneously achieve optimal, so the search algorithm research is to find the optimal relationship between the two.