然而，目前流行的检索工具大多基于关键字查询，常常出现信息过载或有用信息丢失等现象。
However, the currently common search engines are based on keyword query, which usually causes the overloading of information or losing of useful information.
然而，目前流行的检索工具大多基于关键字查询，常常出现信息过载或有用信息丢失等现象。
However, the currently common search engines are based on keyword query, which usually causes the overloading of information or losing of useful information.
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