extinction

名词 extinction:

1. no longer in existence
   同义词：defunctness
2. no longer active; extinguished
3. the reduction of the intensity of radiation as a consequence of absorption and radiation
4. complete annihilation
   同义词：extermination
5. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
   同义词：experimental extinction
6. the act of extinguishing; causing to stop burning
   同义词：extinguishing, quenching

1. The race was threatened with extinction.
   这个种族这时眼看要灭绝了。
2. His movie of the extinction of dinosaurs was a great success.
   他的关于恐龙灭绝的电影取得了巨大的成功。
3. Is the human race threatened with complete extinction?
   人类是否会受到完全灭绝的威胁呢？

ex.tinc.tion

n.（名词）

The act of extinguishing.
灭绝：灭绝的行为
The condition of being extinguished.
被灭绝的条件
The fact of being extinct or the process of becoming extinct:
灭绝：灭绝的事实或变绝种的经过：
例句：
.The most effective agent in the extinction of species is the pressure of other species.(Alfred R. Wallace)
.在种的灭绝中最有影响的力量是其它种的压力.(艾尔弗雷德R.华莱士)

Psychology A reduction or a loss in the strength or rate of a conditioned response when the unconditioned stimulus or reinforcement is withheld.
【心理学】 条件反射减弱：当非条件的刺激或强化停止时，条件反应的速度或力度的减少或丧失
Physiology A gradual decrease in the excitability of a nerve to a previously adequate stimulus, usually resulting in total loss of excitability.
【生理学】 衰竭：神经对足够的刺激所产生的兴奋的逐渐减少，常导致兴奋的完全丧失