最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
There is no special format for Markdown paragraphs, just write the text directly 段落的换行是使用两个以上空格加上回车 .
Of course, you can also use a blank line at the end of a paragraph to indicate the restart of a paragraph.
Markdown can use the following fonts: The display is as follows: You can set up a separation line with more than three asterisks, minus signs, and bottom lines in a line, and there can be nothing else in the line. You can also insert spaces between asterisks or minus signs. A separation line can be established in each of the following ways of writing: The display is as follows: If you want to add a delete line to the text on a paragraph, you only need to add two wavy lines at both ends of the text. An example is as follows: The display is as follows: Underlining can be achieved through the < u > tag of HTML: The display is as follows: The footnote is a supplement to the text. The format of the Markdown footnote is as follows: The following example demonstrates the use of footnotes: The demonstration effect is as follows: 
10.3.1. Font ¶
*斜体文本* _斜体文本_ **粗体文本** __粗体文本__ ***粗斜体文本*** ___粗斜体文本___
10.3.2. Separation line ¶
*** * * * ***** - - - ----------
10.3.3. Delete Lin ¶
RUNOOB.COM GOOGLE.COM ~~BAIDU.COM~~
10.3.4. Underline ¶
<u>带下划线文本u>
10.3.5. Footnote ¶
[^要注明的文本]
创建脚注格式类似这样 [^RUNOOB]。 [^RUNOOB]: 菜鸟教程 -- 学的不仅是技术，更是梦想！！！
