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(4)“付出友善”會“收穫友善” 因為,“付出友善”,哪怕是對別人 付出一個微笑,傳遞一個幽默的表 情,唾液中的免疫球蛋白濃度就會增 加,這種抗體能增強人的免疫系統。 Wellbrook Foundation, Inc.
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