多巴胺被认为是“快乐激素”，产生喜悦感；去甲肾上腺素类似于肾上腺素，导致心跳加速和兴奋感，据来自美国罗格斯大学的人类学家，著名的爱情研究者Helen Fisher所说，这两种化学物质共同引起喜悦感，充沛的精力，失眠，强烈的愿望，食欲的减退和集中的注意力。
Dopamine is thought to be the "pleasure chemical, " producing a feeling of bliss. Norepinephrine is similar to adrenaline and produces the racing heart and excitement.
当你微笑的时候，会排解内啡肽和血清胺，你能分泌快乐的激素。
You release endorphins and serotonin, your feel-good hormones, when you smile.
这种兴奋剂类型的物质能令人心情愉悦，并促进包括血清素在内的某些和快乐有关的激素的分泌。
Moreover, it may enhance the production of "pleasure hormones" such as serotonin.
微笑是因为你很快乐。你的微笑会释放出一种激素，会为你带来更多的快乐。对别人微笑是礼貌、友好的表现。
You smile because you are happy. You smile because it releases those endorphins that bring you extra happiness. You smile at others because it is polite and friendly (and you are glad to see them).
微笑是因为你很快乐。你的微笑会释放出一种激素，会为你带来更多的快乐。对别人微笑是礼貌、友好的表现。
You smile because you are happy. You smile because it releases those endorphins that bring you extra happiness. You smile at others because it is polite and friendly (and you are glad to see them).
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