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lizhijun 多谢回复。
从官方页面摘录的：
Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites. You can configure your engine to search both web pages and images. You can fine-tune the ranking, add your own promotions and customize the look and feel of the search results. You can monetize the search by connecting your engine to your Google AdSense account.
似乎是需要指定搜索某些站点的，而metasearch似乎是可以搜索任意站点的，我理解的有问题吗？