外媒：什么原因可能导致马航飞机失踪？
<p><span word="Traditionally">Traditionally</span> <span word="regarded">regarded</span> <span word="as">as</span> <span word="one">one</span> <span word="of">of</span> <span word="the">the</span> <span word="safest">safest</span> <span word="planes">planes</span> <span word="in">in</span> <span word="the">the</span> <span word="skies">skies</span>, <span word="the">the</span> <span word="Boeing">Boeing</span> 777’<span word="s">s</span> <span word="reputation">reputation</span> <span word="will">will</span> <span word="have">have</span> <span word="been">been</span> <span word="damaged">damaged</span> <span word="by">by</span> <span word="the">the</span> <span word="second">second</span> <span word="fatal">fatal</span> <span word="crash">crash</span> <span word="in">in</span> <span word="less">less</span> <span word="than">than</span> <span word="a">a</span> <span word="year">year</span>.</p><p>波音777机型一向被认为是空中客机中最安全的机型，但是在不到一年的时间里发生的两起坠机事故令它名声扫地。</p><p><span word="There">There</span> <span word="are">are</span> <span word="around">around</span> 1,000 <span word="Boeing">Boeing</span> 777<span word="s">s</span> <span word="in">in</span> <span word="service">service</span>, <span word="and">and</span> <span word="the">the</span> <span word="plane">plane</span> <span word="is">is</span> <span word="a">a</span> <span word="long">long</span> <span word="haul">haul</span> <span word="workhorse">workhorse</span>, <span word="plying">plying</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="longest">longest</span> <span word="routes">routes</span>.</p><p>全球共有1000架波音777客机正在使用中。飞机是一个长距离运输的交通工具，担负着一些最长距离航行的任务。</p><p><span word="It">It</span> <span word="entered">entered</span> <span word="service">service</span> <span word="in">in</span> 1995 <span word="and">and</span> <span word="the">the</span> <span word="National">National</span> <span word="Transportation">Transportation</span> <span word="Safety">Safety</span> <span word="Board">Board</span>, <span word="which">which</span> <span word="is">is</span> <span word="responsible">responsible</span> <span word="for">for</span> <span word="monitoring">monitoring</span> <span word="US">US</span>-<span word="made">made</span> <span word="aircraft">aircraft</span>, <span word="has">has</span> <span word="logged">logged</span> <span word="fewer">fewer</span> <span word="than">than</span> 60 <span word="incidents">incidents</span>.</p><p>波音777在1995年投入使用，美国国家运输安全委员会负责监视美国制造的飞机，至今数据库中有的事故记录不超过60条。</p><p><span word="But">But</span> <span word="the">the</span> <span word="recent">recent</span> <span word="record">record</span> <span word="has">has</span> <span word="been">been</span> <span word="more">more</span> <span word="patchy">patchy</span> <span word="with">with</span> <span word="two">two</span> <span word="major">major</span> <span word="incidents">incidents</span> - <span word="a">a</span> <span word="crash">crash</span> <span word="at">at</span> <span word="San">San</span> <span word="Francisco">Francisco</span> <span word="airport">airport</span> <span word="last">last</span> <span word="July">July</span>, <span word="which">which</span> <span word="claimed">claimed</span> <span word="three">three</span> <span word="lives">lives</span>, <span word="and">and</span> <span word="the">the</span> <span word="crash">crash</span>-<span word="landing">landing</span> <span word="of">of</span> <span word="a">a</span> <span word="British">British</span> <span word="Airways">Airways</span> 777 <span word="at">at</span> <span word="Heathrow">Heathrow</span> <span word="in">in</span> <span word="January">January</span> 2008.</p><p>但是最近两起重大事故使得数据库的记录看起来很不和谐——去年7月份韩亚航空旧金山发生的坠机事故（造成三人死亡）和2008年1月份英国航空的波音777客机在希思罗机场的迫降事件。</p><p><span word="But">But</span> <span word="the">the</span> <span word="Malaysian">Malaysian</span> <span word="disaster">disaster</span> <span word="is">is</span> <span word="very">very</span> <span word="different">different</span> <span word="from">from</span> <span word="both">both</span> <span word="the">the</span> <span word="BA">BA</span> <span word="incident">incident</span> <span word="and">and</span> <span word="the">the</span> <span word="crash">crash</span> <span word="involving">involving</span> <span word="a">a</span> <span word="Asiana">Asiana</span> <span word="Airlines">Airlines</span> <span word="flight">flight</span> <span word="at">at</span> <span word="San">San</span> <span word="Francisco">Francisco</span> <span word="International">International</span> <span word="Airport">Airport</span> <span word="in">in</span> <span word="July">July</span>.</p>
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