stimulus variable

例句：

1. 1.The researcher found that the stimulus variable had a significant impact on the results.
   研究者发现刺激变量对结果有显著影响。
2. 2. The experiment was designed to test the effect of different stimulus variables on learning.
   实验旨在测试不同刺激变量对学习的影响。
3. 3. In psychology, the stimulus variable is often used to measure the effects of environmental factors on behavior.
   在心理学中，刺激变量常用来测量环境因素对行为的影响。