absolute valueThe numerical value of a real number without regard to its sign. For example, the absolute value of -4 is 4.Also callednumerical value 绝对值：不管其符号的一个实数所具有的数值，如-4的绝对值为4也作numerical valueThe modulus of a complex number, equal to the square root of the sum of the squares of the real and imaginary parts of the number.复数的模：一复数的模，等于该数实部部分与虚部部分平方和的平方根
