Whats not clear, he says, is whether happy feelings are the key to longevity or if its something else that causes extended life. We cant draw the kind of final conclusion that the happiness is leading directly to better survival, he says.

　　longevity n. 长寿;寿命

　　draw a conclusion 下结论

　　Others who have done research in this area but havent read the study say this link between a one-day measure and mortality is important.

　　The fact that positive emotions in one day predicted survival is pretty amazing, says Sonja Lyubomirsky, a psychology professor at the University of California, Riverside.

　　We do know that happiness is associated with an extended life span, she says. If we can get people to be happier, would that extend the lifespan? We dont know that yet. Future research can definitely try to show that.

　　Arthur Stone, a professor of psychiatry and psychology at Stony Brook University in New York, who has used measurements over the course of a day in his research, says the fact that the researchers got a relationship with mortality means that the relationship must be fairly robust because they only had 3,800 people and they were only measuring the one day.

　　psychiatry n. 精神病学

　　robust adj. 强健的;健康的

　　And what if some who were measured on that one day were just having a bad day?

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