These precautions keep bird-strike fatalities surprisingly rare: in the past 20 years, only 219 people have died in American airspace as a result of bird impacts.
这些防范措施使撞鸟的不幸事件惊人地减少：二十年来，只有219人在美国航空区域死于撞鸟事件。
These precautions keep bird-strike fatalities surprisingly rare: in the past 20 years, only 219 people have died in American airspace as a result of bird impacts.
这些防范措施使撞鸟的不幸事件惊人地减少：二十年来，只有219人在美国航空区域死于撞鸟事件。
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