俄罗斯的俄新社引述一个没有公布身份的消息来源的话说，飞机坠毁的原因可能是技术故障或者是飞行员操作失误所致。
Russia's RIA Novosti news agency, quoting an unidentified source, said the plane likely crashed because of a technical malfunction or pilot error.
不幸的是，人们作出的愚蠢的决定往往和睡眠不足有着莫大的关系，美国太空总署的一份调查报告显示21%的飞行员操作失误跟疲劳有关。
Unfortunately, there is a strong correlation between poor decision-making and lack of sleep. A NASA study found that 21 percent of pilot errors are related to fatigue.
不幸的是，人们作出的愚蠢的决定往往和睡眠不足有着莫大的关系，美国太空总署的一份调查报告显示21%的飞行员操作失误跟疲劳有关。
Unfortunately, there is a strong correlation between poor decision-making and lack of sleep. A NASA study found that 21 percent of pilot errors are related to fatigue.
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