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HomeBackend DevelopmentPHP Tutorial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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