专家估计，高速路上所发生了严重车祸中有五分之一是因为司机的疲倦所造成的。
Tired drivers cause one in five fatal crashes on motorways, experts estimate.
昨天对我的叔叔来说是最黑暗的一天，因为他发生了严重的车祸。
Yesterday was the darkest day for my uncle, because he had a severe car accident.
他们在瑞典发生了最严重火车车祸的地方旅行。
They travel to the place where the worst train accident in Sweden happened.
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