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。

耶鲁公开课 - 心理学导论课程节选

And so classical conditioning should be the strongest when these two are simultaneous and the response to one is the same as the response to the other.

当无条件刺激与条件刺激同时出现时,经典条件作用的效果最强,两种刺激所引起的反应是相同的。

耶鲁公开课 - 心理学导论课程节选

So it stimulates these myeloid cells to develop along this pathway.

它就是在髓细胞的发育过程中,发挥刺激生成作用的

耶鲁公开课 - 生物医学工程探索课程节选

Erythropoietin, commonly called Epo and its function is to treat anemia because it stimulates blood cell production.

促红细胞素生成素,通常简称为EPO,它的作用是刺激红细胞生成,从而能够治疗贫血

耶鲁公开课 - 生物医学工程探索课程节选