如果知道了网上不同的搜索工具是如何设计的,特别是知道了每个工具的特殊的规则(对不同的工具这常常是不同的),就能更好地使用这些工具,轻轻松松地冲浪。本文将介绍这方面的知识,文中提到的工具是按其实用的程度组织的,并简要地介绍了它们的规则。文中还举出了一些简单的例子,如果想得到更详细的例子,请查看站点上的帮助文档。 If you know how different online search tools are designed, and especially if you know the specific rules for each tool (which is often different for different tools), you can use these tools to surf easily . This article will introduce this knowledge, the tools mentioned in the article are organized according to their practical level, and briefly introduce their rules. The article also cites some simple examples, if you want to get more detailed examples, please refer to the help documentation on the site.