You've already seen in XQuery that a variable is defined by putting a dollar sign ($) in front of an identifier name.
您可能已经看到，XQuery中通过在标识符前加上美元符号（$）来定义变量。
This means that an expression can take any of several forms; for instance, a variable, a plus sign, and a number could be an expression.
这意味着表达式可以是几种格式中的任意一种；例如，一个变量、一个加号或者一个数字都可以是一个表达式。
The direct search with mixed discrete variable was used for the de- sign, and it was run successfully in a microcomputer.
采用混合离散变量的直接搜索法，在微机上运行成功。
The function of remote sign, remote measure, remote control, remote adjustment in the system by using complete redundancy structure to collect and control electrical variable is realized.
根据水电站的特点，采用全分布冗余结构对水电厂的电气量进行采集和控制，实现遥信、遥测、遥控和遥调功能；
Right shifts the value of a variable by the number of bits specified in the value of an expression, maintains the sign, and assigns the result to the variable.
利用运算式值中所指定的位元数来将变数值进行向右移位，保持正负号不变，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, maintains the sign, and assigns the result to the variable.
利用运算式值中所指定的位元数来将变数值进行向右移位，保持正负号不变，然后将结果指派给变数。
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