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

Well, your friend says actually because you're the one who wants to pet the dog,

因为你是那个想要去摸小狗的人，这时你的朋友就会这么说，

If I were 课堂 - SpeakingMax英语口语达人

Well, you could put a baby down, have a picture of a dog here, a picture of a cat here, and see which one the baby looks at.

你可以抱来一个婴儿,在这里呈现一张狗的照片,在这里呈现一张猫的照片,然后观察婴儿会看哪一张照片

耶鲁公开课 - 心理学导论课程节选