he.don.ics

n.(used with a sing. verb)（名詞）（與單數(shù)動詞連用）
The branch of psychology that studies pleasant and unpleasant sensations and states of mind.
快感學：心理學的一個分支，研究快樂和不快樂的感覺及大腦狀態(tài)
Philosophy The branch of ethics that deals with the relation of pleasure to duty.
【哲學】 快樂說：倫理學分支，研究快樂和義務的關系