| 单词 | extinction |
| 释义 | extinction[ik'stiŋkʃən]n. 消失, 消灭, 废止【化】 消光; 熄灭【医】 消退 extinction ex.tinc.tion AHD: [¹k-st¹ngk“sh…n] D.J. [!k6st!0k.*n]K.K. [!k6st!0k.*n]n.（名词）1. The act of extinguishing.灭绝：灭绝的行为2. The condition of being extinguished.被灭绝的条件3. 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：“The most effective agent in the extinction of species is the pressure of other species”(&b{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)4. 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5. 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 |
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