What does the stylesheet in CSS style mean

Stylesheet English translation as a stylesheet, it's good. This code is to tell the browser need to refer to an external style sheet file for that, for example: <link href= "Css/xue51_com_style.css" rel= "stylesheet" Type= "Text/css" means to refer to the xue51_com_ below the CSS folder Style.css This style file, where the Rel (relation) label attribute is used to set the relationship between the object and the link purpose, which indicates what the object you are linking to is something, the value and the relationship that it represents as follows:

Alternate:substitute version of the file that contains the LINK.&NBSP
Appendix:page which is a appendix for T He set of pages. 
bookmark:bookmark. 
Chapter:page This is a Chapter for a set of pages. 
Conte Nts:table of Contents document. 
Copyright:copyright notice for the current page. 
glossary:glossary fo R the current page. 
Help:help document. 
Index:index document for the current page. 
Next:next Document in a sequence. .
Offline:href that contains a path to the CDF file to is used for a Offline FAVORITE.&N Bsp
Prev:previous document in a sequence. 
Section:page This is a section for a set of pages. 
Shortcut : Icon href that contains "a path to" icon file to is used for the favorite or link. 
Start:first Document of a S ET.&NBSP
Stylesheet:style sheet. 
Subsection:page that are a subsection for a set of pages. 
This small English is not Too good, through online translation to get the following:
Standby: Contains a linked file substitution version.
Appendix: The Web page is an appendix to the page set.
Bookmark Bookmark.
Chapter Two: pages, a page Setup chapter.
Content: Table of content files.
All rights reserved: Current page copyright notice.
Glossary: The Vocabulary for the current page.
Help: Help documentation.
Index: The index file for the current page.
Next: The next file in a sequence.
Offline: A CDF file with a hyperlink containing a path can be used for offline favorites.
Prev: The previous document in a sequence.
Section: A Web page is a set of sections.
Shortcut: The icon link contains an icon file that can be used for favorite or link paths.
Start: The first file in a set.
Style: Style sheet.
Division: A page is a group of pages.