色氨酸，一种非常重要的氨基酸，也是血清素(让人感觉良好的化学物质)的前导，会转换成褪黑色素，刺激加强松弛感和愉悦。
Tryptophan is an essential amino acid that ACTS as a precursor of serotonin - the feel-good chemical - and can be converted to melatonin, eliciting relaxation and pleasure.
神经传递素是一种在神经细胞间传递信号的化学物质，在ADHD患者中，这种化学物质常常是指多巴胺，该物质的作用是调节愉悦和满足感。
A neurotransmitter is a chemical that carries messages between nerve cells and, in the case of ADHD, that chemical is often dopamine, which controls feelings of reward and pleasure.
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 gene, known as 5-HTT, is involved with the transport of serotonin, a feelgood chemical, in the brain.
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