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China has a different database from that of global Yahoo!, so the same query will retrieve different results in the two search engines. It is the underlying database that determines the content and thus the search results of a search engine, and it is the database, rather than the interface, that is the focus of the current study.
If a website is indexed in the database of a search engine, then it will be searchable through that engine.
The words indexed and covered are used interchangeably throughout this article. Yahoo.