- 关键字：
- abstract
- as
- base
- bool
- break
- byte
- case
- catch
- char
- check
- class：用于声明类
- const
- continue
- decimal
- default
- delegate
- do
- double
- else
- enum
- event
- explicit
- extern
- false
- finally
- fiexed
- float
- for
- foreach
- goto
- if
- implicit
- in
- in(generic modifier)
- int
- interface
- internal
- is
- lock
- long
- namespace
- new
- null
- object
- operator
- out
- out(generic modifier)
- override
- params
- private
- protected
- public
- readonly
- ref
- return
- sbyte
- sealed
- short
- sizeof
- stackalloc
- static
- string
- struct
- switch
- this
- throw
- true
- try
- typeof
- unit
- ulong
- unchecked
- unsafe
- ushort
- using
- virtual
- void
- volatile
- while
2、注释：上节有提到
多行注释 /* ... */
单行注释 //
3、变量
4、函数
5、标示符
