spontaneous: implies lack of prompting and connotes naturalness: a ~ burst of applause.


impulsive: implies acting under stress of emotion orthe spirit of the moment, seemingly without thought or volition: ~ act of violence.


instinctive: stresses spontaneous action involving neither judgment nor will: blinking is an ~ reaction.


automatic: implies prompt action engaging neither the mind nor the emotions and connotes a predictable and unvarying response: his denial was ~.


mechanical: stresses the lifeless, often perfunctory character of the response: over the years, her style of teaching became ~.


spontaneous自发的: 没人提示或催促，即自然的，impulsive冲动的:受当前情绪、精神影响，没有思考或意志，instinctive本能的: 自发的不需判断、决心，automatic自动: 快速(prompt)固定(predictable,unvarying)的行为，mechanical机械的: 死板(lifeless)的常敷衍了事(perfunctory)的


记忆方法: 1）首字母IS AIM是目标<==自动

         2）自动的意思是没有深思mean acting or acted without deliberation.