火星极地冰盖正融化
<p><span word="Huge">Huge</span> <span word="sections">sections</span> <span word="of">of</span> <span word="the">the</span> <span word="ice">ice</span> <span word="around">around</span> <span word="the">the</span> <span word="south">south</span> <span word="pole">pole</span> <span word="of">of</span> <span word="Mars">Mars</span> <span word="are">are</span> <span word="melting">melting</span> <span word="in">in</span> <span word="this">this</span> <span word="summer">summer</span>'<span word="s">s</span> <span word="warm">warm</span> <span word="weather">weather</span>.</p><p>在这个夏日炎热的天气里，火星南极周围的巨大冰面正融化。</p><p><span word="The">The</span> <span word="ice">ice</span> <span word="cap">cap</span> - <span word="made">made</span> <span word="of">of</span> <span word="solid">solid</span> <span word="carbon">carbon</span> <span word="dioxide">dioxide</span> <span word="at">at</span> <span word="temperatures">temperatures</span> <span word="as">as</span> <span word="low">low</span> <span word="as">as</span> -143 - '<span word="boils">boils</span>' <span word="every">every</span> <span word="summer">summer</span> (<span word="or">or</span>, <span word="more">more</span> <span word="correctly">correctly</span>, '<span word="sublimates">sublimates</span>' <span word="directly">directly</span> <span word="from">from</span> <span word="solid">solid</span> <span word="form">form</span> <span word="to">to</span> <span word="gas">gas</span>), <span word="leaving">leaving</span> <span word="huge">huge</span> <span word="pits">pits</span> <span word="in">in</span> <span word="the">the</span> <span word="Martian">Martian</span> <span word="polar">polar</span> <span word="ice">ice</span>.</p><p>低至零下142度的气温下，由固体二氧化碳形成的冰冠每个夏天都会“沸腾”（或者更准确地说是从固体直接“升华”成气体），并在火星的极地冰里留下巨大的凹点。</p><p><span word="The">The</span> '<span word="gold">gold</span>' <span word="pits">pits</span> <span word="isn">isn</span>'<span word="t">t</span> <span word="likely">likely</span> <span word="to">to</span> <span word="be">be</span> <span word="ferried">ferried</span> <span word="back">back</span> <span word="to">to</span> <span word="Earth">Earth</span>, <span word="though">though</span> - <span word="scientists">scientists</span> <span word="remain">remain</span> <span word="unsure">unsure</span> <span word="of">of</span> <span word="the">the</span> <span word="chemical">chemical</span> <span word="composition">composition</span> <span word="of">of</span> <span word="the">the</span> <span word="yelllow">yelllow</span>, <span word="shimmering">shimmering</span> <span word="dust">dust</span> <span word="that">that</span> <span word="lines">lines</span> <span word="the">the</span> <span word="pit">pit</span> <span word="walls">walls</span> <span word="every">every</span> '<span word="summer">summer</span>'.</p><p>可是那些在凹点的金线不太可能被带回地球，所以科学家还不能确定这在每个“夏天”都在凹点排成线而且发光的黄色灰尘的化学成分。</p><p><span word="Martian">Martian</span> <span word="summers">summers</span> <span word="are">are</span> <span word="rather">rather</span> <span word="chilly">chilly</span> <span word="in">in</span> <span word="comparison">comparison</span> <span word="to">to</span> <span word="our">our</span> <span word="own">own</span> - <span word="the">the</span> <span word="temperature">temperature</span> <span word="usually">usually</span> <span word="remains">remains</span> <span word="below">below</span> <span word="zero">zero</span> <span word="degrees">degrees</span> <span word="centigrade">centigrade</span>. <span word="It">It</span>'<span word="s">s</span> <span word="still">still</span> '<span word="warm">warm</span>' <span word="enough">enough</span>, <span word="relatively">relatively</span> <span word="speaking">speaking</span>, <span word="to">to</span> <span word="make">make</span> <span word="the">the</span> '<span word="dry">dry</span> <span word="ice">ice</span>' <span word="of">of</span> <span word="the">the</span> <span word="polar">polar</span> <span word="ice">ice</span> <span word="caps">caps</span> <span word="boil">boil</span> <span word="off">off</span>.</p><p>火星的夏天跟我们的相比非常寒冷，气温通常保持在零摄氏度以下。相对将极地的冰冠气化成“干冰”，这样的温度仍然足够“温暖了”。</p><p><span word="Part">Part</span> <span word="of">of</span> <span word="the">the</span> <span word="fascination">fascination</span> <span word="of">of</span> <span word="Mars">Mars</span> <span word="for">for</span> <span word="both">both</span> <span word="scientists">scientists</span> <span word="and">and</span> <span word="writers">writers</span> <span word="has">has</span> <span word="always">always</span> <span word="been">been</span> <span word="how">how</span> <span word="similar">similar</span> <span word="the">the</span> <span word="planet">planet</span>'<span word="s">s</span> <span word="weather">weather</span> <span word="is">is</span> <span word="to">to</span> <span word="ours">ours</span> - <span word="with">with</span> <span word="seasons">seasons</span>, <span word="currents">currents</span>, <span word="and">and</span> <span word="polar">polar</span> <span word="ice">ice</span> <span word="caps">caps</span>. <span word="Mars">Mars</span> <span word="has">has</span> <span word="no">no</span> <span word="surface">surface</span> <span word="water">water</span>, <span word="however">however</span>.</p>
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