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。

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And down the track comes a trolley car, at the end of the track are five workers, the brakes don't work, the trolley car is about to careen into the five and kill them.

电车沿着轨道从远处驶来，轨道的尽头有五名工人，电车刹车坏了，这五名工人即将被撞死。

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And as a result of writing it down and keeping track, he produced a very clear record, and scientific evidence, that using this procedure could protect a population of people from the disease.

凭借他的持续关注和追踪,他做出了十分清晰的记录,留下了科学证据,证明这种方法,可以让人们不再得这种病

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