'stimulus'是英语词汇，中文意思是“刺激”。这个词语广泛用于心理、生理和经济等领域，表示外界的物理或心理因素对生物体或经济的激励作用。
例句：
1. The sound of the bell is a stimulus that signals the beginning and end of class.（铃声作为刺激，指示课程的开始和结束。）
2. The bright colors of the flowers are a visual stimulus that attracts bees. （花卉的鲜艳颜色是吸引蜜蜂的视觉刺激。）
3. The drug acts as a stimulus for the nervous system, increasing alertness and decreasing fatigue.（这种药物作为刺激物作用于神经系统，增加警觉性，减少疲劳感。）
4. The sudden loud noise was a stimulus that triggered the startle reflex.（突然的响声是引发惊恐反应的刺激。）
5. The government provided a stimulus package to boost the economy during the recession.（政府提供了一揽子的刺激措施来刺激衰退的经济。）
6. The new tax policy was designed as a stimulus to encourage investment in renewable energy.（新的税收政策旨在作为刺激物促进对可再生能源的投资。）
7. The teacher used positive feedback as a stimulus to reinforce good behavior in the classroom.（老师使用积极的反馈作为刺激来强化课堂上的好行为。）
8. The athlete received an electric shock as a stimulus to activate the muscles during rehabilitation.（运动员在恢复过程中接受电击作为刺激来激活肌肉。）
9. The scientist conducted experiments to investigate the effects of different stimuli on the brain.（科学家进行实验来研究不同刺激对大脑的影响。）
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