And, in fact, once you teach an animal something, if you stop doing the teaching the response goes away and this is known as extinction.
事实上,条件反射形成以后,如果得不到强化,条件反应就会逐渐消失,这就是消退。
It's coming down now in 2006; they're gradually coming down as the boom unwinds.
006年才呈现下跌趋势,随着繁荣消退,预期也渐渐降低
wouldn't there be extinction after a while?
在强化消失后是否也会发生消退?
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