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It is now possible to quantify people's levels of happiness pretty accurately by asking them, by observation, and by measuring electrical activity in the brain, in degrees from terrible pain to sublime joy.
现在，通过询问，通过观察，通过测量大脑的电活动，从可怕的痛苦到崇高的快乐，可以相当准确地量化人们的幸福水平。