段落（<p>）：一个以上的链接的行句子组成，以一个以上的空行划分出不同的段落。
标题（<ht>~<h6>）：有两种形式，Setext（底线形式），=（<h1>）和-（<h6>）；Atx（行首插入），<h1>~<h6>分别对应 # 的个数
示例（来自官方）：
A First Level Header
====================
A Second Level Header
---------------------
Now is the time for all good men to come to
the aid of their country. This is just a
regular paragraph.
The quick brown fox jumped over the lazy
dog's back.
### Header 3
> This is a blockquote.
>
> This is the second paragraph in the blockquote.
>
> ## This is an H2 in a blockquote
<h1>A First Level Header</h1>
<h2>A Second Level Header</h2>
<p>Now is the time for all good men to come to
the aid of their country. This is just a
regular paragraph.</p>
<p>The quick brown fox jumped over the lazy
dog's back.</p>
<h3>Header 3</h3>
<blockquote>
<p>This is a blockquote.</p>
<p>This is the second paragraph in the blockquote.</p>
<h2>This is an H2 in a blockquote</h2>
</blockquote>
强调（<em>,<strong>）：用星号（*）和下滑线（_,__）来标记
例子：
Some of these words *are emphasized*.
Some of these words _are emphasized also_.
Use two asterisks for **strong emphasis**.
Or, if you prefer, __use two underscores instead__.
HTML:
<p>Some of these words <em>are emphasized</em>.
Some of these words <em>are emphasized also</em>.</p>
<p>Use two asterisks for <strong>strong emphasis</strong>.
Or, if you prefer, <strong>use two underscores instead</strong>.</p>
列表（<li>）：无序列表在项目中使用（*，+，-）来表示，而有序是使用数字加英文句点后加项目来实现
例子（同+-）：
* Candy.
* Gum.
* Booze
1. Red
2. Green
3. Blue
HTML:
<ul>
<li>Candy.</li>
<li>Gum.</li>
<li>Booze.</li>
</ul>
<ol>
<li>Red</li>
<li>Green</li>
<li>Blue</li>
</ol>
PS：如果你在项目之间插入空行，那项目的内容会用;包起来，你也可以在一个项目内放上多个段落，只要在它前面缩排 4 个空白或 1 个 tab
链接（<a>）
行内形式：
<span style="white-space:pre"></span>This is an [example link](http://example.com/).
加了title属性后
This is an [example link](http://example.com/ "With a Title").
等价于：
<span style="white-space:pre"></span><p>This is an <a href="http://example.com/">
<span style="white-space:pre"></span>example link</a>.</p>
<span style="white-space:pre"></span><p>This is an <a href="http://example.com/" title="With a Title">
<span style="white-space:pre"></span>example link</a>.</p>
参考形式：
I get 10 times more traffic from [Google][1] than from
[Yahoo][2] or [MSN][3].
[1]: http://google.com/ "Google"
[2]: http://search.yahoo.com/ "Yahoo Search"
[3]: http://search.msn.com/ "MSN Search"
等价于
<p>I get 10 times more traffic from <a href="http://google.com/"
title="Google">Google</a> than from <a href="http://search.yahoo.com/"
title="Yahoo Search">Yahoo</a> or <a href="http://search.msn.com/"
title="MSN Search">MSN</a>.</p>
图片（<img>）：
行内：
<span style="white-space:pre"></span>
参考：
<span style="white-space:pre"></span>![alt text][id]
<span style="white-space:pre"></span>[id]: /path/to/img.jpg "Title"
等价于：
<span style="white-space:pre"></span><img src="/path/to/img.jpg" alt="alt text" title="Title" />
代码（<code>）：用反引号·来表示
例子：
I strongly recommend against using any `<blink>` tags.
I wish SmartyPants used named entities like `—`
instead of decimal-encoded entites like `—`.
HTML：
<p>I strongly recommend against using any
<code><blink></code> tags.</p>
<p>I wish SmartyPants used named entities like
<code>—</code> instead of decimal-encoded
entites like <code>—</code>.</p>