translation.en: You take two groups of people who are similar in all relevant respects, and you remind one group that they're going to die but not the other, then you compare their behavior.
translation.zh: 你找两组 各个方面都很相似的人， 并且提醒一组人他们即将死去 而不告诉另一群人，然后比较他们的行为。