关键词：全文检索，中文分词；相关度排序；PHP；MYSQL [gap=4270]Key words：full—text retrieval，chinese word segmentation；relevancy ranking；PHP；MYSQL
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词组分类是按相关度排序的，从最相关到最不相关。
Word categories are sorted by correlation, from greatest to least.
此外，Google Books现在不仅能够以页码排序，还可以根据相关度排序。
In addition, instead of just seeing results sorted by page number, Google Books can now also sort results by relevance.
最直接的挑战就是，Google Books的深度搜索和更好的相关度排序，这些通常比我们在用的图书馆联机目录要好，而且它总是会有结果返回。
The immediate challenge is that Google Books' deeper indexing and more advanced relevancy ranking usually works better than that of our local catalogs-and it always returns results.
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