New fossil discoveries help explain bird evolution 化石新发现有助于解释鸟类进化过程
<p><span word="New">New</span> <span word="fossil">fossil</span> <span word="discoveries">discoveries</span> <span word="help">help</span> <span word="explain">explain</span> <span word="bird">bird</span> <span word="evolution">evolution</span> 化石新发现有助于解释鸟类进化过程</p><p>科学家们通过结合有关化石的一系列新发现及最新技术，建造出了最先进的原始鸟类头骨模型。这一成果为鸟喙的进化史提供了新解释。</p><p> <span word="It">It</span>’<span word="s">s</span> <span word="well">well</span> <span word="known">known</span> <span word="that">that</span> <span word="birds">birds</span> <span word="evolved">evolved</span> <span word="from">from</span> <span word="dinosaurs">dinosaurs</span> - <span word="gradually">gradually</span> <span word="growing">growing</span> <span word="feathers">feathers</span> <span word="and">and</span> <span word="taking">taking</span> <span word="to">to</span> <span word="the">the</span> <span word="air">air</span>. <span word="But">But</span> <span word="their">their</span> <span word="tiny">tiny</span> <span word="delicate">delicate</span> <span word="skulls">skulls</span> <span word="have">have</span> <span word="been">been</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="study">study</span> <span word="as">as</span> <span word="they">they</span>’<span word="re">re</span> <span word="rarely">rarely</span> <span word="preserved">preserved</span> <span word="as">as</span> <span word="fossils">fossils</span>.</p><p>众所周知，鸟类是由恐龙进化而来的。它们逐渐地长出羽毛并飞向天空。但由于鸟类的头骨微小而纤细，因此很少有保存完好的化石，这使相关研究的展开变得困难。</p><p><span word="Now">Now</span> <span word="researchers">researchers</span> <span word="have">have</span> <span word="combined">combined</span> <span word="extraordinary">extraordinary</span> <span word="new">new</span> <span word="fossil">fossil</span> <span word="discoveries">discoveries</span> <span word="with">with</span> <span word="the">the</span> <span word="latest">latest</span> <span word="CT">CT</span> <span word="scanning">scanning</span> <span word="techniques">techniques</span> <span word="to">to</span> <span word="make">make</span> <span word="the">the</span> <span word="most">most</span> <span word="advanced">advanced</span> 3<span word="D">D</span> <span word="model">model</span> <span word="of">of</span> <span word="the">the</span> <span word="skull">skull</span> <span word="of">of</span> <span word="a">a</span> <span word="primitive">primitive</span> <span word="bird">bird</span>. <span word="They">They</span> <span word="say">say</span> <span word="creatures">creatures</span> <span word="existed">existed</span> <span word="for">for</span> <span word="much">much</span> <span word="of">of</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> <span word="the">the</span> <span word="dinosaurs">dinosaurs</span> <span word="that">that</span> <span word="looked">looked</span> <span word="half">half</span>-<span word="bird">bird</span>, <span word="half">half</span>-<span word="dinosaur">dinosaur</span>.</p><p>现在，研究人员们把令人惊叹的化石新发现和最新电子计算机断层扫描技术结合起来，制作出了最为先进的原始鸟类头骨3<span word="D">D</span>模型。他们说，这类看起来半鸟半恐龙的生物存在于恐龙时代的大部分时期内。</p><p><span word="Ichthyornis">Ichthyornis</span>, <span word="which">which</span> <span word="was">was</span> <span word="the">the</span> <span word="size">size</span> <span word="of">of</span> <span word="a">a</span> <span word="seagull">seagull</span>, <span word="had">had</span> <span word="a">a</span> <span word="beak">beak</span> <span word="and">and</span> <span word="a">a</span> <span word="brain">brain</span> <span word="much">much</span> <span word="like">like</span> <span word="modern">modern</span> <span word="birds">birds</span> <span word="but">but</span> <span word="the">the</span> <span word="sharp">sharp</span> <span word="teeth">teeth</span> <span word="and">and</span> <span word="powerful">powerful</span> <span word="jaws">jaws</span> <span word="of">of</span> <span word="dinosaurs">dinosaurs</span> <span word="like">like</span> <span word="Velociraptor">Velociraptor</span>. <span word="Its">Its</span> <span word="bones">bones</span> <span word="were">were</span> <span word="first">first</span> <span word="found">found</span> <span word="in">in</span> <span word="the">the</span> 1870<span word="s">s</span> <span word="drawing">drawing</span> <span word="the">the</span> <span word="attention">attention</span> <span word="of">of</span> <span word="Charles">Charles</span> <span word="Darwin">Darwin</span>. <span word="Modern">Modern</span>-<span word="day">day</span> <span word="scientists">scientists</span> <span word="say">say</span> <span word="this">this</span> <span word="amazing">amazing</span> <span word="bird">bird</span>, <span word="which">which</span> <span word="gives">gives</span> <span word="a">a</span> <span word="picture">picture</span> <span word="of">of</span> <span word="what">what</span> <span word="the">the</span> <span word="first">first</span> <span word="beaks">beaks</span> <span word="were">were</span> <span word="like">like</span>, <span word="has">has</span> <span word="been">been</span> <span word="under">under</span> <span word="their">their</span> <span word="noses">noses</span> <span word="the">the</span> <span word="whole">whole</span> <span word="time">time</span>.</p>
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