“One home was close to hiking trails, making going hiking very easy,” he said in an e-mail. “Thinking about the research, I argued that the hiking trails could be a factor contributing to our happiness, and we should worry less about things like how pretty the kitchen floor is or whether the sinks are fancy.
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"We've been thinking about this for several years now - we've had a look at a number of different approaches, and didn't have any success," one of the research team, Derek Tittensor, told BBC News.
“对这个问题，我们已经思考了几年——我们看到了各种各样的估计值，却没有取得任何成果。”研究团队的一员，Derek Tittensor对BBC News说。
It was a question I found myself thinking about when I returned to Gombe on July 14th last year, 40 years to the day after I arrived with my mother, Vanne, to begin my research.
这也正是我于去年4月14日返回冈贝后发现自己正在思考的问题，那天是我和母亲温妮一起来到这里开始研究工作整整40年的日子。
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