学习下Markdown，方便做笔记。

#Markdown

##Chapter 1

###Section 1.1

\$\frac{mark}{down}\$.
 
Text attributes *italic*, **bold**, `monospace`, ~~strikethrough~~ .

A [link](http://www.freopen.com).
 
Shopping list:
 * apples
 * oranges
 * pears

Numbered list:
 1. apples
 * oranges
 * pears

Markdown

Chapter 1

Section 1.1

$\frac{mark}{down}$.

Text attributes italic, bold, monospace, strikethrough .

A link.

Shopping list:

• apples
• oranges
• pears

Numbered list:

1. apples
2. oranges
3. pears