Passage 2
Searching by keywords is the most common method of using a search engine, but the problems with keywords are the relatively imprecise results and the retum of a lot of irrelevant information Keywords may have more than one meaning and search results may be found only by using a synonym of, the keyword. The method of browsing on the other hand takes too much to find the relevant information. Directories like Yahoo try to 【circumvent】 the problem, but the manual process of classifying material on the Web takes up too much time, resulting in very few search results.Therefore new paradigms of searching are needed as well as new software that is able to categorize Web sites automatically.
The majority of search engines come from the United States and have specialized in English resources and information reflecting the American culture. People who do not speak English or who are non-native speakers have therefore many disadvantages on the Web. The centralized approach to retrieval has extreme difficulty in coping with the multilingual and multicultural nature of the information society. The Intemet has become success throughout the world, but the American search engines operate with a US-centric company structure and tend to concentrate upon the English language. Although many search engines have subsidiaries in many other countries, like Japan or Italy, the way the information is presented is the American way and may not reflect the logie of the people who are using it.
15.A major problem of keyword searching is ______.