for why you became afraid of dogs is that one day a dog came up and he was a neutral stimulus.
你之所以害怕狗,是因为,某天有只狗向你跑来,狗是一个中性刺激。
耶鲁公开课 - 心理学导论课程节选
The bell was a neutral stimulus.
只是一个中性刺激。
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