Late last month, a helicopter and passenger airliner collided mid-air over the Potomac River in Washington DC, killing all 67 on board both aircraft. This week, a Delta Air Lines jet crashed on the runway in Toronto, catching fire and rolling upside down, though no one was killed. Between those two incidents, a commuter plane went down off the coast of Alaska, killing 10 people. Then on Wednesday a mid-air collision in Arizona left two people dead. Is aviation’s enviable safety record breaking down?
上月底，一架直升机和一架客机在华盛顿特区的波托马克河上空相撞，机上67人全部遇难。本周，一架达美航空(Delta Air Lines)的喷气式飞机在多伦多的跑道上坠毁，起火并翻转，但无人遇难。在这两起事件之间，一架通勤飞机在阿拉斯加州海岸附近坠毁，导致10人死亡。然后在周三，亚利桑那发生了一起空中相撞事故，导致两人死亡。航空业令人羡慕的安全记录是否正在崩溃？
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