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.
不同于界限模糊的绿色，红色无疑象征着活力和兴奋，红色使血压上升，心跳加速。
There's no equivocation with red. It has energy and excitement, actually raising the blood pressure and making the heart beat faster.
当一段新的恋情开始时，你总会感觉到肾上腺素的飙升，此时你心跳加速，头晕目眩，你变得清醒，机敏和兴奋。
Young relationships start out with an adrenaline rush. Your heart RACES, you get giddy, you're alert, awake and excited.
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