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来源：雅诚德英语网
Sally Hawkins as Poppy in Happy Go Lucky. The 5-htt gene could help to explain why some people are naturally more cheerful than others. Photograph: pr.
深红色装扮的莎莉·霍金斯是个乐天派。5 - HTT基因能帮助解释为什么一些人天生就比其他人更乐观。照片：pr ？
Sally Hawkins as Poppy in Happy Go Lucky. The 5-htt gene could help to explain why some people are naturally more cheerful than others. Photograph: pr.
深红色装扮的莎莉·霍金斯是个乐天派。5 - HTT基因能帮助解释为什么一些人天生就比其他人更乐观。照片：pr ？