求翻译：If you live in the northern hemisphere, January is probably not your favourite month. It tends to dispirit people more than any other. We all know why: foul weather, post-Christmas debt, the long wait before your next holiday, quarterly bills, dark evenings and dark mornings. At least, that is the way it seems. For while all these things might contribute to the way you feel, there is one crucial factor you probably have not accounted for: the state of mind of your friends and relatives. Recent research shows that our moods are far more strongly influenced by those around us than we tend to think. Not only that, we are also beholden to the moods of friends of friends, and of friends of friends of friends - people three degrees of separation away from us who we have never met, but whose disposition can pass through our social network like a virus.是什么意思？

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