When Pavlov put food powder in the dog's mouth and saliva was generated, that's an unconditioned stimulus giving rise to an unconditioned response.

巴甫洛夫给狗喂食,狗会分泌唾液，这就是无条件刺激引起了无条件反应。

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Well, when Pavlov, for instance, started before conditioning there was simply an unconditioned stimulus, the food in the mouth, and an unconditioned response, saliva.

比如，在条件作用形成之前,只是简单的存在着无条件刺激，即食物，以及无条件反应，即唾液。

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But Pavlov observed that when somebody entered the room who typically gave him the food powder, the dog--the food powder saliva would start to come out.

他注意到,当给它喂食的人,进屋时，狗便开始分泌唾液。

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Pavlov, when he started this research, had no interest at all in learning.

在研究的最初，巴甫洛夫，对学习行为毫无兴趣。

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This is Pavlov's famous dog and it's an example of scientific serendipity.

这便是巴甫洛夫的那条著名的狗,这是一个科学研究中的意外。

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It was thought up by Pavlov.

经典条件作用是巴甫洛夫提出的。

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