NOT运算符。这是摆立即在前面的功能，操作员，或子表达式扭转布尔表达式的意义。

The NOT operator. This is placed immediately in front of the feature, operator, or subexpression to reverse the Boolean meaning of the expression.

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操作员，(2)运算符：(1)操作机器或装置的人员。(2)数学函数，例如一，十等。好评(1)。

Operator: (1) One who operates machine or device. (2) Mathematical function such as 1, 10, etc.

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