请老师帮忙，难道每一句都做了索引？解决思路
请老师帮忙，难道每一句都做了索引？
百度搜索“广告植入现代商业社会是很正常的“可以完全匹配出这一句话，我在想，难道百度把搜索的文章第一个句子都拆分保存到数据库当中，并作了索引？不然怎么那么快的匹配出来呢？但仔细一想也不太可能啊？汉字最少也得5000字以上不算标点符号，如果这样不规则的组合，得组合成多少句不一的句子啊？光9位数字就可以组合这么多了：
9^9=387420489 何况5000字，？请老师解释一下。
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全文索引
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