external spur

例句：

1. 1. The researcher found that the external stimulus was a major factor influencing the outcome.
   研究者发现，外部刺激是影响结果的主要因素。
2. 2.The company's decision to expand into new markets was influenced by external factors such as economic conditions and global trade policies.
   该公司决定进入新市场的决定受到经济条件和全球贸易政策等外部因素的影响。
3. 3.The study suggests that external stimuli can have a profound impact on an organism's behavior and development.
   研究表明，外部刺激可以对生物的行为和发展产生深远的影响。