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There's always a risk in flying, but the phase in which a plane is cruising at high altitude is widely considered to be safe. And that's what makes the mystery of what happened to so confounding. 飞行总是存在风险，但人们普遍认为飞机在较高的高度巡航的阶段是安全的。因此马航MH370的失联才如此让人迷惑。 "Whatever happened happened quickly and resulted in a catastrophic departure from the air," Mark Rosenker, former chairman of the National Transportation Safety Board who is now a consultant with CBS news, told NPR's Melissa Block. 美国国家运输安全委员会的前任主席马克·罗森克目前是CBS资讯的一名顾问，他对NPR的梅丽莎·布洛克表示，“不论发生了什么，一定是在瞬间发生，并且导致了飞机在空中发生了灾难性的事故”。 There have been a number of cases in which planes have fallen from the sky — from factors that include catastrophic failure and sabotage. As Patrick Smith, a commercial pilot who runs the popular: 飞机从空中坠落曾经有一些案例，原因包括严重故障和遭到蓄意破坏。民航飞行员帕特里克·史密斯的分析获得了广泛认同： "All we know for sure is that a plane went down with no warning or communication from the crew. That the crash did not happen during takeoff or landing — the phases of flight when most accidents occur — somewhat limits the possibilities, but numerous possibilities remain. The culprit could be anything from sabotage to an in-flight fire to a catastrophic structural failure of some kind — or, as is so common in airline catastrophes, some combination or compounding of human error and/or mechanical malfunction." | 
