A bad day should weaken the relationship, Stone says. What its saying is there are enough people here that people having odd days didnt really matter very much. Some people had bad days and some had good days. If they had been able to measure several days with these techniques, one would guess that the relationship would be even stronger.

　　Laura Kubzansky, an associate professor in the Department of Society, Human Development and Health, at Harvards School of Public Health in Boston, says theres a burgeoning body of work that suggests positive psychological functioning benefits health, and this study is significant because it adds to the arsenal.

　　It could say to people, you should take your mood seriously, Kubzansky says. I think people sort of undervalue emotional life anyway. This highlights the idea that if you are going through a period where youre consistently distressed, its probably worth paying attention to how you feel it matters for both psychological and physical health.

　　sort of 有点儿;稍稍

　　highlight v. 突出;强调;使显著

　　distressed adj. 痛苦的;忧虑的

　　This study asked participants to rate how happy, excited and content they felt at four points during a single day 7 a.m., 7 p.m. and a half-hour after each. They used a rating scale from 1 to 4 .

　　Generally, they were less happy when they woke up and most happy at 7 p.m., Steptoe says.

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