EXPLAIN_FROM_CATALOG过程将使用目录表中的片段内容生成有关一条语句的解释信息。

The EXPLAIN_FROM_CATALOG procedure produces explain information about a statement using the content of the section from the catalog tables.

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检查系统目录表的内容。

Examining the contents of the system catalog tables.

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根据系统目录的内容，账单表是空的。

According to the system catalogs, the bills table is empty.

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搜索引擎使得发现这些内容变得容易，且其他的网站可以链接到它，包括类似于移动市场的web应用产品目录表。

Search engines make it easy to discover that content and other websites can link to it, including catalogues of web apps similar to mobile marketplaces.

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如果对某个Web页面不满意，那么请更改XML文档(在src目录中)或样式表(在rules目录中)，但是决不要试图编辑publish目录中的任何内容。

If you're not happy with a Web page, change the XML document (in the SRC directory) or the stylesheet (in the rules directory), but never try to edit anything in the publish directory.

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如果对某个Web页面不满意，那么请更改XML文档(在src目录中)或样式表(在rules目录中)，但是决不要试图编辑publish目录中的任何内容。

If you're not happy with a Web page, change the XML document (in the SRC directory) or the stylesheet (in the rules directory), but never try to edit anything in the publish directory.

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