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.
他们的评述始于基于打造爱情理论和实践基础的一种观念：因为爱情是物质世界的一部分，所以爱情必有其法则。
They begin with something that provides a foundation upon which the theory and practice of love can be built: "Because it is part of the physical universe, love has to be lawful."
许多人衡量成功的标志不再是物质方面，而是创造、自主、快乐、参与、冒险、刺激和爱情。
More people are defining success in terms of intangibles... creativity, autonomy, pleasure, participation, adventure, stimulation, and love.
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