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？

The conditioned response is a preparation for the unconditioned stimulus.

条件反应是对无条件刺激的一种准备。

A reinforced trial is when the conditioned stimulus and the unconditioned stimulus go together.

强化尝试是指条件刺激，与无条件刺激同时出现的时候。

Well, you show the thing that would cause you to have the fear without the unconditioned stimulus.

找出在非条件刺激不存在的情况下，能够使你感到恐惧的东西。