hedonics

he.don.ics

n.(used with a sing. verb)（名词）（与单数动词连用）
The branch of psychology that studies pleasant and unpleasant sensations and states of mind.
快感学：心理学的一个分支，研究快乐和不快乐的感觉及大脑状态
Philosophy The branch of ethics that deals with the relation of pleasure to duty.
【哲学】 快乐说：伦理学分支，研究快乐和义务的关系