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What is a Dinosaur?Millions of years ago, long before there were any people, there were dinosaurs. Dinosaurs were one of several kinds of prehistoric reptiles that lived during the Mesozoic Era, the "Age of Reptiles." Dinosaurs were reptiles and most hatched from eggs. No dinosaurs could fly and none lived in the water. Plant-eating sauropods were the largest animals to ever walk on Earth - but blue whales are more massive than any of the dinosaurs were! The largest dinosaurs were over 100 feet (30 m) long and up to 50 feet (15 m) tall (like Argentinosaurus, Seismosaurus, Ultrasauros, Brachiosaurus, and Supersaurus). The smallest dinosaurs, like Compsognathus, were about the size of a chicken. Most dinosaurs were in-between. It is very difficult to figure out how the dinosaurs sounded, how they behaved, how they mated, what color they were, or even how to tell whether a fossil was male or female. were vertebrate animals that dominated terrestrial ecosystems for over 160 million years, first appearing approximately 230 million years ago. At the end of the Cretaceous Period, 65 million years ago, dinosaurs succumbed to a catastrophic extinction, which ended their dominance on land. Taxonomists consider modern birds to be the direct descendants of theropod dinosaurs.Since the first dinosaur was recognized in the 19th century, mounted, fossilized dinosaur skeletons have become major attractions at museums around the world. Dinosaurs have become a part of world culture and remain consistently popular among children and adults alike. They have been featured in best-selling books and films such as Jurassic Park, and new discoveries are regularly covered by the media.The term dinosaur is sometimes used informally to describe other prehistoric reptiles, such as the pelycosaur Dimetrodon, the winged pterosaurs and the aquatic ichthyosaurs, plesiosaurs and mosasaurs, although technically none of these were dinosaurs.
安妮宝贝88
百万年前,恐龙统治着地球.而后,恐龙灭绝了.究竟发生了什么?我们知道它们不是突然灭绝的,而可能是在几百万年间全部灭绝的.恐龙生存的年代,整个地球的气候温暖潮湿,有许多丛林.然而,地球的气候不断逐渐改变.当一些地域的气候变得寒冷干燥时,这部分的丛林便死去了.恐龙无从觅食物.这可能是恐龙灭绝的原因之一.Millions of years ago, the dinosaurs(恐龙) ruled the earth. Since then, there have been no dinosaurs. What happened to then? We know they did not all die at once. It may have taken a few million years for all of them to die. In the days of the dinosaurs, the whole earth was warm and wet. There were many green jungles(丛林). But the earth changes slowly, all the time. When parts of the earth became cold and dry, the jungles there died. Then dinosaurs could not find enough to eat. This must be on reason why the dinosaurs died out.
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dinosaur
dinosaur
1、读音：英 ['daɪnəsɔː(r)] 美 ['daɪnəsɔːr]
2、词类：n.
3、形容词: dinosauric
4、常用词组
bipedal dinosaur
（1）读音：[ˈbaiˌpedəl ˈdainəsɔ:]
（2）释义：双足恐龙
（3）例句
Based on compounding cycloid track, a leg mechanism of a bipedal dinosaur was designed.
基于组合摆线运动轨迹设计了一种两足恐龙腿机构.
5、例句
（1）The blue whale is bigger than the biggest dinosaur.
蓝鲸比最大的恐龙还要大。
（2）We reconstructed what the dinosaur looked like from a few of its bones.
我们根据恐龙的一些骨头重组恐龙的原貌。
（3）His movie of the extinction of dinosaurs was a great success.
他的关于恐龙灭绝的电影取得了巨大的成功。
（4）Archaeologists excavated fossilized dinosaur tracks from the riverBed
考古学家从河床中挖掘出恐龙的足迹化石。
（5）Pandas have existed since the dinosaur era.
大熊猫的历史可以追溯到恐龙时代。
金吉小酉子
恐龙的英文介绍是：
1、英文介绍：
Dinosaur refers to the recent common ancestor and all descendants of Triceratops, modern birds and Lianglong. For the convenience of research, dinosaurs can be divided into birds and non birds dinosaurs.
Among them, non bird dinosaurs only lived in the Mesozoic and became extinct 65 million years ago. This entry mainly introduces non bird dinosaurs.
Vigorous limbs, long tail and huge body are the portrayal of some non bird dinosaurs. They mainly inhabit in the forest or open areas of the lake shore plain.
2、中文翻译：
恐龙，是指三角龙，现代鸟类和梁龙最近的共同祖先及其所有后代。为方便研究，恐龙可分为鸟类和非鸟恐龙。其中，非鸟恐龙只生活在中生代，已于6500万年前全部灭绝。
而本词条主要介绍非鸟恐龙。矫健的四肢、长长的尾巴和庞大的身躯是部分非鸟恐龙的写照。它们主要栖息于湖岸平原的森林地或开阔地带。
外形特征：
大部分的恐龙要比大型蜥脚类恐龙还小得多。现有的证据表明，恐龙的平均大小在三叠纪、早侏罗纪、晚侏罗纪和白垩纪都不断变化。
大部分兽脚类恐龙的体重在100到1000公斤之间，而全新世的掠食性肉食动物则多半在10到100公斤之间。恐龙的体重估计值，大多介于1到10吨之间。伦敦国立自然历史博物馆的一个研究指出恐龙的体重平均值约在100公斤左右，而新生代的哺乳类体重平均值多在2到5公斤之间。
以上内容参考 百度百科—恐龙
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TheDinosauriaDinosaurs,oneofthemostsuccessfulgroupsofanimals(intermsoflongevity)thathaveeverlived,evolvedintomanydiversesizesandshapes,withmanyequallydiversemodesofliving.Theterm"Dinosauria"wasinventedbySirRichardOwenin1842todescribethese"fearfullygreatreptiles,"specificallyMegalosaurus,Iguanodon,andHylaeosaurus,theonlythreedinosaursknownatthetime.ThecreaturesthatwenormallythinkofasdinosaurslivedduringtheMesozoicEra,fromlateintheTriassicperiod(about225millionyearsago)untiltheendoftheCretaceous(about65millionyearsago).Butwenowknowthattheyactuallyliveontodayasthebirds.RunningDeinonychus.©1995B.CunninghamSomethingstokeepinmindaboutdinosaurs:•Noteverythingbiganddeadisadinosaur.Alltoooften,bookswritten(ormoviesmade)forapopularaudienceincludeanimalssuchasmammoths,mastodons,pterosaurs,plesiosaurs,ichthyosaurs,andthesail-backedDimetrodon.Dinosaursareaspecificsubgroupofthearchosaurs,agroupthatalsoincludescrocodiles,pterosaurs,andbirds.althoughpterosaursarecloserelations,theyarenottruedinosaurs.Evenmoredistantlyrelatedtodinosaursarethemarinereptiles,whichincludetheplesiosaursandichthyosaurs.MammothsandmastodonsaremammalsanddidnotappearuntilmanymillionsofyearsafterthecloseoftheCretaceousperiod.Dimetrodonisneitherareptilenoramammal,butabasalsynapsid,i.e.,anearlyrelativeoftheancestorsofmammals.•Notalldinosaurslivedatthesametime.Differentdinosaurslivedatdifferenttimes.DespitetheportrayalsinmovieslikeKingKongandJurassicPark,noStegosauruseversawaTyrannosaurus,becauseTyrannosaurusdidn'tappearonthesceneuntil80orsomillionyearsfollowingtheextinctionofstegosaurs.ThesamegoesforApatosaurus("Brontosaurus")—it'sboneswerealreadywell-fossilizedbythetimeT.rexcamealong.•Dinosaursarenotextinct.Technically.Basedonfeaturesoftheskeleton,mostpeoplestudyingdinosaursconsiderbirdstobedinosaurs.Thisshockingrealizationmakeseventhesmallesthummingbirdalegitimatedinosaur.Soratherthanreferto"dinosaurs"andbirdsasdiscrete,separategroups,itisbesttorefertothetraditional,extinctanimalsas"non-aviandinosaurs"andbirdsas,well,birds,or"aviandinosaurs."Itisincorrecttosaythatdinosaursareextinct,becausetheyhaveleftlivingdescendantsintheformofcockatoos,cassowaries,andtheirpals—justlikemodernvertebratesarestillvertebrateseventhoughtheirCambrianancestorsarelongextinct.
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