位元数不断改变，网际网路的规模也是。
The number of bits being moved around, the size of the Internet.
第一个字节定义后面紧跟的八位元数，如果是7f或更小，这就是等价的ascii值。
The first byte defines the number of octets to follow, or if it is 7f or less, it is the value of an ASCII equivalent.
利用运算式值中所指定的位元数将变数值进行向右移位，不须保持正负号，然后将结果指派给变数。
Right shifts the value of a variable by the number of bits specified in the value of an expression, without maintaining sign, and assigns the result to the variable.
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