modulus of congruence

例句：

1. 1. The equation has a modulus of 10.
   这个方程的模为10。
2. 2.The number 5 is a modulus of the equation 7x + 3 = 0.
   5是方程7x + 3 = 0的模。
3. 3.The modulus of the division operation is calculated by taking the greatest common divisor of the two numbers.
   除法操作的模是通过取两个数字的最大公约数来计算的。