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上海肛肠镜检查疼么上海市第一人民医院看便秘好不好So in 1994 a small unmanned orbiter Clementine于是柯蕾曼堤号无人太空船was sent back to the moon,在1994年再度前往月球the first spacecraft to make the journey in more than 20 years.这是20多年来首度展开这趟旅程的太空载具And this mission would go somewhere new.而这次的任务也不同于以往Technology had moved on since the 70s,科技自70年代后有了长足进步and so Clementine would be able to reach an area所以柯蕾曼堤号可以抵达of the moon that had never been seen in detail before.月球从未被详仔观察过的区域The lunar poles.那就是月球的两极地带Clementine spent 2 months bombarding柯蕾曼堤号花了两个月the moon with radio waves,对地球放送无线电波and in doing so,因此it made a discovery that scientists had never dreamt of.有了科学家做梦也想不到的重大发现They found what appeared to be patches of ice.他们发现了像冰层的地方Its radar was getting signals being bounced back太空船的雷达from the surface very strongly in a way收到了强大的回传讯号that was consistent with their being patches of ice down there.让人觉得下方应该是有冰层And er it#39;s not a lot of ice- it could er, could fill er,那些冰层并不大,融解的话could fill plenty of Olympic sized swimming pools,可以装满很多座标准游泳池but if you were to melt it and sp,但若将融化的水量sp it out over the lunar surface it均匀分布在月球表面would be I don#39;t know a millimetre thick or something.水的深度大概只有一公厘左右But you#39;re not going to produce oceans所以这些冰层on the moon from this ice.不可能形成海洋But enough there for humans to exploit.但是让人类利用绰绰有余The existence of water on the moon even if it was frozen月球上有冰层的事实changed everything.改变了一切The bleak and barren landscape wasn#39;t so inhospitable after all.看来荒芜贫瘠的月球,毕竟没有那么不适合人类居住Suddenly the possibilities seemed endless.突然间出现了无穷无尽的可能性With life-sustaining water,有了能维持生命的水the moon could one day be a base in space,月球未来很可能成为太空中的基地a stepping stone to the rest of the universe.征宇宙的踏脚石Humans might even live there one day.有朝一日甚至可以让人类居住The love affair was back on.熄灭的爱火重新燃起As if to drive home the renewed fascination,仿佛为了进一步撮合人类与月球的情缘45 years after President Kennedy#39;s famous pledge在肯尼迪总统承诺to take us to the moon,要让人类征月球的45年之后another US President launched a new mission.另一位美国总统推动了一项新任务Returning to the moon is an important step重返月球是我们太空计划中for our space programme.很重要的一步Establishing and extending human presence进驻月球on the moon could vastly reduce可大幅降低the cost of further space exploration.未来探索太空的成本Making possible very more ambitious missions.让我们得以推动更具企图心的任务The moon is a logical step toward further progress and achievement.追求未来的进步与成就,月球是顺理成章的下一步Human beings are headed into the cosmos.人类即将征宇宙It may have lacked some of his predecessor#39;s rhetorical flourish,布希总统的演讲也许少了甘迺迪总统的华丽辞藻but 35 years after the last man stepped off the moon,但在最后一名太空人登陆月球的35年之后we are finally going back.我们终于要回去了NASA has aly started planning the new lunar mission.航太总署已经开始规划新的登月任务And it#39;s going to be big.这次的规模将不同凡响We are planning to go to the moon in a particular,我们打算以不同于different way than what we did with Apollo Apollo was short,阿波罗计划的方式前往月球sortie missions,阿波罗计划都是短期任务and we#39;re planning to go to the moon to stay.这次我们打算长期停留 Article/201505/374276嘉兴肛肠科哪家医院好排名哪里 上海肛泰肛肠医院治疗费用

上海痔疮中医治疗栏目简介:;Shanghai Live; focuses on big events in the city and major issues around the world, and presents them in a practical and audience-friendly manner to meet the ever-evolving needs of Shanghai#39;s English-speaking viewers,both local and expatriate.《直播上海英语电台》集中报道城市大事件以及全球热点话题,并以观众喜闻乐见的方式呈现给大家,从而满足上海本地以及上海海外人士的英语需求。 Article/201509/398890上海肛肠镜检查需要注意什么 one in our particular case第一章,生物起源takes us back to 4.5 million years.要将我们带回450万年前to when the earth was really quite young.当时的地球,初生不久Exactly what triggered life here is still a mystery生命的起源至今仍是未解之谜but there are several theories.但也有不少理论The most common one is that life began purely by accident.最常见的理论认为生命的起源完全是巧合In pools of primodial soup,起源于原始汤的水池里full of chemicals called amino acids富含名为氨基酸的化学物质These molecules would have collided at random for millions of years数百万年来,这些分子不断地随机碰撞until the perfect combination just happened直到一次完美地化合反应发生the ultimate lucky break that started the chain of life.这次幸运之极的碰撞,开启了生物起源之门It is extremely unlikely that life could spontaneously create itself.生命的自发产生,乍看之下让人难以置信But I don#39;t think that#39;s a problem with this theory.但在这一理论中,这却并非不可能之事It#39;s like winning a lottery.就像是中票with the odds are astro-nomical most weeks someone hits the jackpot.虽然概率微小,但几乎每周都有人中头But there is another intriguing idea called ;panspermia,;另一种有趣的理论,被称为;有生源说;which says that life could have originated somewhere else ..称生命可能起源于其它地方and it#39;s been sp from planet to planet被传播到各个行星by asteroids.载体就是小行星It seems possible that lumps of rock could carry frozen organisms inside them小行星内部似乎可以携带被冰冻的微生物organisms able to with stand extremes of temperature and the vacuum of space.能够忍受极端的温度和真空条件的微生物If so, asteroids could even now若真如此,小行星现在依然be transporting life to other worlds.能够作为行星间生物传播的载体Regardless of which theory is right,无论哪一种理论是对的once life begins, the next chapter starts.生命一旦出现,我们便进入了下一章That#39;s all about survival.物竞天择,适者生存survival links you me and ET它将你我还有外星人联系在一起and it generates rules all of its own.并且演变出了一套自己的法则Survival demands a source of energy what we call food,生存需要能量,即食物来维持 or else it would grind to a halt.否则生命便会慢慢消亡Once nourished, life can then copy itself to一旦有了养料,生物便开始了繁殖protect against the death of any one individual.来抵御种族的灭亡Ultimately, that leads to evolution最终,这导致了进化evolution that would happen even on alien worlds,这种进化即使在其它星球同样可能发生producing, in some instances,在某些情形下 animals that I think we would recognize as being alive,产生的动物我认为我们可以称之为生命even if they look a bit strange.即便它们看起来有些奇怪 Article/201505/376689上海宝宝便秘肛裂治疗医院要多少钱

浦东新区治疗内痔医院栏目简介:《造物小百科How it’s made》介绍了许多东西的制作或者说发明方法,非常实用。其中的英语视频发音地道,内容浅显易懂,过程形象生动,是提高英语听力水平,积累英语知识和一些简单生活常识的好素材。 Article/201508/391047 上海医博肛肠医院收费贵不贵上海市医博肛肠医院



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