例如，将算术运算符(如+)施加于某个元素时，该运算符会自动提取该元素的数值。

For example, arithmetic operators such as +, when applied to an element, automatically extract the numeric value of the element.

youdao

一元运算符对单个操作数执行操作，如返回数值表达式的负值或正值。

Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.

youdao

运算数：运算符来进行运算操作的数值。

One of the values on which an operator operates.

youdao