Bereavement includes grief, the psychological reaction of the individual, and mourning, the social expression of grief. 喪失包括悲傷，這屬于個(gè)體的心理反應，還包括哀掉，這是悲傷的社會(huì )表現。
The discipline is a branch of psychophysics in that it is interested in the relation between sensory input stimuli and the behavioural or psychological response that they provoke. 這是一個(gè)精神物理學(xué)的分支學(xué)科，它側重于研究感官的輸入刺激和這些刺激所引發(fā)的心理反應或行為之間的關(guān)系。
