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。
2
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。
3
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.