2015年考研英语作文素材精选 十三
<p> 2015考研英语作文素材精选</p><p> 45.<span word="The">The</span> <span word="source">source</span> <span word="of">of</span> <span word="Energy">Energy</span></p><p> <span word="A">A</span> <span word="summary">summary</span> <span word="of">of</span> <span word="the">the</span> <span word="physical">physical</span> <span word="and">and</span> <span word="chemical">chemical</span> <span word="nature">nature</span> <span word="of">of</span> <span word="life">life</span> <span word="must">must</span> <span word="begin">begin</span>, <span word="not">not</span> <span word="on">on</span> <span word="the">the</span> <span word="Earth">Earth</span>, <span word="but">but</span> <span word="in">in</span> <span word="the">the</span> <span word="Sun">Sun</span>; <span word="in">in</span> <span word="fact">fact</span>, <span word="at">at</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="very">very</span> <span word="center">center</span>. <span word="It">It</span> <span word="is">is</span> <span word="here">here</span> <span word="that">that</span> <span word="is">is</span> <span word="to">to</span> <span word="be">be</span> <span word="found">found</span> <span word="the">the</span> <span word="source">source</span> <span word="of">of</span> <span word="the">the</span> <span word="energy">energy</span> <span word="that">that</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="constantly">constantly</span> <span word="pours">pours</span> <span word="out">out</span> <span word="into">into</span> <span word="space">space</span> <span word="as">as</span> <span word="light">light</span> <span word="and">and</span> <span word="heat">heat</span>. <span word="This">This</span> <span word="energy">energy</span> <span word="is">is</span> <span word="librated">librated</span> <span word="at">at</span> <span word="the">the</span> <span word="center">center</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="as">as</span> <span word="billions">billions</span> <span word="upon">upon</span> <span word="billions">billions</span> <span word="of">of</span> <span word="nuclei">nuclei</span> <span word="of">of</span> <span word="hydrogen">hydrogen</span> <span word="atoms">atoms</span> <span word="collide">collide</span> <span word="with">with</span> <span word="each">each</span> <span word="other">other</span> <span word="and">and</span> <span word="fuse">fuse</span> <span word="together">together</span> <span word="to">to</span> <span word="form">form</span> <span word="nuclei">nuclei</span> <span word="of">of</span> <span word="helium">helium</span>, <span word="and">and</span> <span word="in">in</span> <span word="doing">doing</span> <span word="so">so</span>, <span word="release">release</span> <span word="some">some</span> <span word="of">of</span> <span word="the">the</span> <span word="energy">energy</span> <span word="that">that</span> <span word="is">is</span> <span word="stored">stored</span> <span word="in">in</span> <span word="the">the</span> <span word="nuclei">nuclei</span> <span word="of">of</span> <span word="atoms">atoms</span>. <span word="The">The</span> <span word="output">output</span> <span word="of">of</span> <span word="light">light</span> <span word="and">and</span> <span word="heat">heat</span> <span word="of">of</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="requires">requires</span> <span word="that">that</span> <span word="some">some</span> 600 <span word="million">million</span> <span word="tons">tons</span> <span word="of">of</span> <span word="hydrogen">hydrogen</span> <span word="be">be</span> <span word="converted">converted</span> <span word="into">into</span> <span word="helium">helium</span> <span word="in">in</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="every">every</span> <span word="second">second</span>. <span word="This">This</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="has">has</span> <span word="been">been</span> <span word="doing">doing</span> <span word="for">for</span> <span word="several">several</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="millions">millions</span> <span word="of">of</span> <span word="year">year</span>.</p><p> <span word="The">The</span> <span word="nuclear">nuclear</span> <span word="energy">energy</span> <span word="is">is</span> <span word="released">released</span> <span word="at">at</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="center">center</span> <span word="as">as</span> <span word="high">high</span>-<span word="energy">energy</span> <span word="gamma">gamma</span> <span word="radiation">radiation</span>, <span word="a">a</span> <span word="form">form</span> <span word="of">of</span> <span word="electromagnetic">electromagnetic</span> <span word="radiation">radiation</span> <span word="like">like</span> <span word="light">light</span> <span word="and">and</span> <span word="radio">radio</span> <span word="waves">waves</span>, <span word="only">only</span> <span word="of">of</span> <span word="very">very</span> <span word="much">much</span> <span word="shorter">shorter</span> <span word="wavelength">wavelength</span>. <span word="This">This</span> <span word="gamma">gamma</span> <span word="radiation">radiation</span> <span word="is">is</span> <span word="absorbed">absorbed</span> <span word="by">by</span> <span word="atoms">atoms</span> <span word="inside">inside</span> <span word="the">the</span> <span word="Sun">Sun</span> <span word="to">to</span> <span word="be">be</span> <span word="reemitted">reemitted</span> <span word="at">at</span> <span word="slightly">slightly</span> <span word="longer">longer</span> <span word="wavelengths">wavelengths</span>. <span word="This">This</span> <span word="radiation">radiation</span> , <span word="in">in</span> <span word="its">its</span> <span word="turn">turn</span> <span word="is">is</span> <span word="absorbed">absorbed</span> <span word="and">and</span> <span word="reemitted">reemitted</span>. <span word="As">As</span> <span word="the">the</span> <span word="energy">energy</span> <span word="filters">filters</span> <span word="through">through</span> <span word="the">the</span> <span word="layers">layers</span> <span word="of">of</span> <span word="the">the</span> <span word="solar">solar</span> <span word="interior">interior</span>, <span word="it">it</span> <span word="passes">passes</span> <span word="through">through</span> <span word="the">the</span> <span word="X">X</span>-<span word="ray">ray</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="spectrum">spectrum</span> <span word="eventually">eventually</span> <span word="becoming">becoming</span> <span word="light">light</span>. <span word="At">At</span> <span word="this">this</span> <span word="stage">stage</span>, <span word="it">it</span> <span word="has">has</span> <span word="reached">reached</span> <span word="what">what</span> <span word="we">we</span> <span word="call">call</span> <span word="the">the</span> <span word="solar">solar</span> <span word="surface">surface</span>, <span word="and">and</span> <span word="can">can</span> <span word="escape">escape</span> <span word="into">into</span> <span word="space">space</span> <span word="without">without</span> <span word="being">being</span> <span word="absorbed">absorbed</span> <span word="further">further</span> <span word="by">by</span> <span word="solar">solar</span> <span word="atoms">atoms</span>. <span word="A">A</span> <span word="very">very</span> <span word="small">small</span> <span word="fraction">fraction</span> <span word="of">of</span> <span word="the">the</span> <span word="Suns">Suns</span> <span word="light">light</span> <span word="and">and</span> <span word="heat">heat</span> <span word="is">is</span> <span word="emitted">emitted</span> <span word="in">in</span> <span word="such">such</span> <span word="directions">directions</span> <span word="that">that</span> <span word="after">after</span> <span word="passing">passing</span> <span word="unhindered">unhindered</span> <span word="through">through</span> <span word="interplanetary">interplanetary</span> <span word="space">space</span>, <span word="it">it</span> <span word="hits">hits</span> <span word="the">the</span> <span word="Earth">Earth</span>.</p>
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