factorial
adj, n (mathematics 数) (of the) product of a whole number and all those whole numbers below it 阶乘; 阶乘的; 因数的
factorial 5 (represented as 5!), ie the product of 5
4 3
2 15的阶乘(记作5!, 为54321的乘积).
Perhaps in those days I was. Pierre and I did have a very good time at the ball. But that was the last moment of happiness in our lives. That night everything changed.