在语法2中，-运算符用作一元求反运算符，指示表达式的负值。

In Syntax 2, the - operator is used as the unary negation operator to indicate the negative value of an expression.

youdao

在语法2中，-运算符用作一元求反运算符，指示表达式的负值。

In Syntax 2, the - operator is used as the unary negation operator to indicate the negative value of an expression.

youdao