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·潘克斯普

·潘克斯普

·潘克斯普

·潘克斯普

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"It's joy , it's positive engagement with life , " said Jaak Panksepp, a Bowling Green University psychology professor .

“笑是欢乐，是积极地参与生活，”鲍林格林大学（BowlingGreenUniversity ）心理学教授亚普 ·潘克斯普（JaakPanksepp ）说。

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