Once they start applying the positive reinforcements with the dog and teaching the dog and the dog is responding.

他们开始对狗狗进行正强化训练教导狗狗的时候，狗狗就会做出回应。

There is also positive reinforcement from the dopamine-induced euphoria, again leading to more drug use.

多巴胺介导的欣快感也会产生“正强化”，又一次导致滥用。

This reward-based learning process is called positive and negative reinforcement, and basically goes like this.

这类奖励为本的学习过程，称之为正强化和负强化，基本上是这样运行的。