translation.en: For 75 years, we've tracked the lives of 724 men, year after year, asking about their work, their home lives, their health, and of course asking all along the way without knowing how their life stories were going to turn out.
translation.zh: 在75年时间里， 我们跟踪了724个人的一生， 年复一年，了解他们的工作、 家庭生活、健康状况， 当然，在这一过程中， 我们完全不知道他们的人生 将走向何方。