Assuming a life expectancy of 80, saving the lives of the students, with an average age of 20, saves 1,200 life years, while saving the workers, with an average age of 45, saves 1,050.
假设预期寿命为 80 岁,若挽救学生的生命,他们的平均年龄为 20 岁,你
拯救了 1200 个寿命年,工人平均年龄为 45 岁,如果拯救他们,你则挽回了 1050 个寿命年。