Instead symbols like + or * are used to define functions that can do things like normal numerical addition and subtraction.
相反，使用 +或 *等符号定义可以执行普通数字加减法的函数。
Ratio - the kilogram scale is an example of a ratio scale — the symbols that are assigned to object attributes have numerical meaning.
定比尺度(ratio)—千克尺度是定比尺度的一个示例？分配给物体属性的符号具有数字意义。
You can perform various operations on those symbols (such as computing ratios) that you cannot perform using numerical values obtained using less powerful measurement scales.
您可以对这些符号执行各种运算（如计算比率），而对于通过使用功能不那么强大的衡量标准获得的数值，您不能使用这些运算。
A new method of map symbols recognition was proposed based on numerical background expression.
提出一种基于数值背景表达的地图符号识别方法。
LISP: Powerful computer programming language designed for manipulating lists of data or symbols rather than processing numerical data, used extensively in artificial-intelligence applications.
LISP语言：功能强大的计算机程序语言，设计来处理资料或符号的目录，而不是处理数值资料，广泛为人工智能应用程序采用。
LISP: Powerful computer programming language designed for manipulating lists of data or symbols rather than processing numerical data, used extensively in artificial-intelligence applications.
LISP语言：功能强大的计算机程序语言，设计来处理资料或符号的目录，而不是处理数值资料，广泛为人工智能应用程序采用。
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