The trolley car is a runaway thing and you're making a split second choice.

电车已失控，而你必须在那一瞬间做出选择。

耶鲁公开课 - 公正课程节选

So, studies with police officers using reaction time in split-second choices on who to shoot find that your stereotypical attitudes play a huge role in who you're likely to shoot when they're holding an object in their hand that's unclear.

一些针对警察的研究,用霎间的反应时间让他们作出选择,应该向谁开枪，研究发现这些刻板态度,能极大的影响你选择向谁开枪,当他们手里拿着不明物体时。

耶鲁公开课 - 心理学导论课程节选