epidemiologist n. 流行病学家

　　How happy a person is at any point in time, he says, is a product of some background disposition; some people tend to be happier than others, but also what they are doing, who they are with, and other features of that point in time. Both are important.

　　Its perfectly true that someones happiness over a single day will be affected by what happens to them over that period, Steptoe says. However, survey experts and psychologists have come to the view that in many ways, this is a better approach to understanding how people actually feel than asking them general questions about how happy they are. Responses to general questions are influenced strongly by personality, by what people think they ought to say and by recollections that might not be quite accurate, Steptoe says.

　　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.

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