I think the idea of a stock must have been invented independently at many times in history.
我认为股票这个概念,在历史上被反复提出过多次
When the conditioned stimulus and the unconditioned stimulus are brought together over and over and over again, pretty soon the conditioned stimulus gives rise to the response.
当条件刺激与非条件刺激,同时且多次反复出现,条件刺激很快也能引起条件反应。
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