conditioning agent

例句：

1. 1. The drug is a conditioning agent that helps the patient recover from addiction.
   这种药物是一种条件刺激物，有助于患者从成瘾中恢复。
2. 2. In animal behavior studies, conditioning agents are used to study how animals learn and respond to stimuli.
   在动物行为研究中，条件刺激物被用来研究动物如何学习和对刺激做出反应。
3. 3. The experiment was designed to test whether the conditioning agent could be effective in treating depression.
   这个实验旨在测试条件刺激物是否能有效治疗抑郁症。