指示对象是否包含不精确计算，如浮点运算。
Indicates whether the object contains an imprecise computation, such as floating point operations.
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.
指示规则运算式是否在输入字串中寻找比对。
Indicates whether the regular expression finds a match in the input string.
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