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.
血清素刺激脑内啡的分泌，而这种内啡肽则激发人愉悦的感觉。
Serotonin also stimulates the release of endorphins, which give us a feeling of pleasure.
血清素刺激脑内啡的分泌，而这种内啡肽则激发人愉悦的感觉。
Serotonin also stimulates the release of endorphins, which give us a feeling of pleasure.
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