The gene, known as 5-HTT, is involved with the transport of serotonin, a feelgood chemical, in the brain.
这个基因称为5-HTT基因，涉及大脑中血清素的运输，血清素是一种让人感到愉悦的化学物质。
The 5-htt gene could help to explain why some people are naturally more cheerful than others.
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。
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 ？
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