Suppose you're the driver of a trolley car, and your trolley car is hurtling down the track at 60 miles an hour.

假设你是一名电车司机，你的电车以60英里/小时的速度,在轨道上飞驰。

耶鲁公开课 - 公正课程节选

This time you're not the driver of the trolley car, you're an onlooker.

这次你不再是电车司机了，只是一名旁观者。

耶鲁公开课 - 公正课程节选