(20)export
MSDN只说The export keyword is not supported on templates.一种导出语句吧..

(21)extern
extern 意为“外来的” 它的作用在于告诉编译器：有这个变量，它可能不存在当前的文件中，但它肯定要存在于工程中的某一个源文件中或者一个Dll的输出中。声明变量是在其他文件中声明(也可以看做是引用变量).Objects and variables declared as extern declare an object that is defined in another translation unit or in an enclosing scope as having external linkage.

(22)false,true
bool类型的两个枚举值.

(23)float
声明浮点型变量或函数.

(24)for
一种循环语句(可意会不可言传).Use the for statement to construct loops that must execute a specified number of times.

(25)friend
声明友元函数或者类.The friend keyword allows a function or class to gain access to the private and protected members of a class.

(26)goto
无条件跳转语句.Performs an unconditional transfer of control to the named label.

(27)if
条件语句.Controls conditional branching.常与else一起用.

(28)inline
声明定义内联函数,编译时将所调用的代码嵌入到主函数中.The inline specifiers instruct the compiler to insert a copy of the function body into each place the function is called.

(29)int
声明整型变量或函数.

(30)long
声明长整型变量或函数.

(31)mutable
This keyword can only be applied to non-static and non-const data members of a class. If a data member is declared mutable, then it is legal to assign a value to this data member from a const member function.

(32)namespace
Dynamically imports an element behavior into a document.

(33)new
动态内存分配.Allocates memory for an object or array of objects of type-name from the free store and returns a suitably typed, nonzero pointer to the object.

(34)operator
The operator keyword declares a function specifying what operator-symbol means when applied to instances of a class.

(35)private
类私有函数和数据成员的标示.When preceding a list of class members, the private keyword specifies that those members are accessible only from member functions and friends of the class. This applies to all members declared up to the next access specifier or the end of the class.

(36)protected
The protected keyword specifies access to class members in the member-list up to the next access specifier (public or private) or the end of the class definition.

(37)public
When preceding a list of class members, the public keyword specifies that those members are accessible from any function. This applies to all members declared up to the next access specifier or the end of the class.

(38)register
声明积存器变量.The register keyword specifies that the variable is to be stored in a machine register, if possible.这个关键字命令编译器尽可能的将变量存在CPU内部寄存器中,而不是通过内存寻址访问,从而提高效率。

(39)return
子程序返回语句(可以带参数，也看不带参数),返回函数调用点.Terminates the execution of a function and returns control to the calling function (or, in the case of the main function, transfers control back to the operating system). Execution resumes in the calling function at the point immediately following the call.

(40)short
声明短整型变量或函数.

(41)signed,unsigned
声明有符号类型变量或函数;声明无符号类型变量或函数.

(42)static
声明静态变量.When modifying a variable, the static keyword specifies that the variable has static durationinitializes it to 0 unless another value is specified.

(43)struct
声明结构体变量或函数.struct 类型是一种值类型，通常用来封装小型相关变量组.

(44)switch
Allows selection among multiple sections of code, depending on the value of an integral expression.

(45)template
模板.The template declaration specifies a set of parameterized classes or functions.

(46)this
The this pointer is a pointer accessible only within the nonstatic member functions of a class, struct, or union type.