NASA将向火星发射直升机，拍摄火星鸟瞰图！
<p><span word="NASA">NASA</span> <span word="announced">announced</span> <span word="this">this</span> <span word="afternoon">afternoon</span> <span word="that">that</span> <span word="it">it</span> <span word="plans">plans</span> <span word="to">to</span> <span word="launch">launch</span> <span word="a">a</span> <span word="tiny">tiny</span>, <span word="four">four</span>-<span word="pound">pound</span>, <span word="autonomous">autonomous</span> <span word="helicopter">helicopter</span> <span word="along">along</span> <span word="with">with</span> <span word="its">its</span> 2020 <span word="rover">rover</span> <span word="mission">mission</span>. <span word="And">And</span> <span word="if">if</span> <span word="you">you</span> <span word="think">think</span> <span word="this">this</span> <span word="sounds">sounds</span> <span word="relatively">relatively</span> <span word="cool">cool</span>, <span word="well">well</span>: <span word="you">you</span>'<span word="re">re</span> <span word="right">right</span>.</p><p>今天下午美国国家航空暨太空总署(<span word="NASA">NASA</span>)拟送微型、约四磅（3.6斤）的无人直升机完成2020年的火星探测任务，如果你觉得听起来很酷，那就对了。</p><p><span word="The">The</span> <span word="experimental">experimental</span>, <span word="softball">softball</span>-<span word="sized">sized</span> <span word="drone">drone</span> <span word="would">would</span> <span word="be">be</span> <span word="the">the</span> <span word="first">first</span> <span word="airborne">airborne</span> <span word="vehicle">vehicle</span> <span word="to">to</span> <span word="fly">fly</span> <span word="around">around</span> <span word="within">within</span> <span word="Mars">Mars</span>'<span word="s">s</span> <span word="atmosphere">atmosphere</span> <span word="other">other</span> <span word="than">than</span> <span word="the">the</span> <span word="landers">landers</span> <span word="that">that</span> <span word="have">have</span> <span word="delivered">delivered</span> <span word="other">other</span>, <span word="ground">ground</span>-<span word="based">based</span> <span word="rovers">rovers</span>.</p><p>这架垒球大小的实验无人机，不同于之前送到火星地表上探测仪，它被直接送到火星的大气层。</p><p><span word="In">In</span> <span word="order">order</span> <span word="to">to</span> <span word="design">design</span> <span word="a">a</span> <span word="flying">flying</span> <span word="vehicle">vehicle</span> <span word="that">that</span> <span word="would">would</span> <span word="actually">actually</span> <span word="work">work</span> <span word="on">on</span> <span word="another">another</span> <span word="planet">planet</span>, <span word="NASA">NASA</span> <span word="scientists">scientists</span> <span word="faced">faced</span> <span word="a">a</span> <span word="number">number</span> <span word="of">of</span> <span word="chanllenges">chanllenges</span>.</p><p>为了使这家飞行器真正能够在火星上运行，<span word="NASA">NASA</span>的科学家面对了一系列的挑战。</p>
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