unconditioned stimulusˌʌnkənˈdiʃəndˈstimjuləs短语⁷⁹⁶⁹⁸ 基本例句 无条件刺激,无条件剌激,非条件刺激物 Fear conditioning reflex is a form of defense responses that subjects come to express to conditioned stimulusCSthat are paired with unconditioned stimulusUS. 恐惧条件反射是条件性刺激和非条件性刺激联系在一起时，机体对条件性刺激产生的一种防御性反应。 cnki