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。那就是非条件刺激引起了非条件反射。

What's the unconditioned stimulus?

什么是无条件刺激？

What's the unconditioned response?

无条件反应是什么？

The second unconditioned object is the World (§35).

理性第二个无条件的对象就是世界。

My unconditioned reaction was that I should look away.

我本能的反应是转移我的目光。