Prática de Shadowing: Evolution of Dinosaurs in 10 Minutes - Aprenda a falar inglês com vídeo
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If you traveled 250 million years into the past, you'd be witnessing the dawn of dinosaurs.
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One of the leading theories is that dinosaurs evolved from a species known as archosaurs.
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These were the dominant reptiles that appeared during the late Permian period.
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To some, they may even look like dinosaurs.
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And that's because they were ancestors to these incredible creatures.
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Over time, the archosaurs split up into two groups.
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One of these groups led to crocodiles, and the other led to dinosaurs, which continued evolving into thousands of different species.
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One of the main traits they eventually gained was their bipedal abilities.
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Early dinosaurs began to walk on two legs, freeing their front limbs for other uses, like grabbing food and defending themselves.
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And that's just the start of their evolutionary journey.
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Let's travel back in time 250 million years ago and witness the history of dinosaurs in 10 minutes.
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Triassic Period As you enter this new era, you'll notice that the dinosaurs running around look pretty different from what you're used to seeing.
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One of the earliest dinosaurs that emerged from the archosaurs was the Eoraptor.
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This little guy was about the size of a dog barely one meter tall and weighing in at a meager 10 kilograms.
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You know, we typically think of dinosaurs as these massive creatures, but it'll be a couple million more years before that started to happen.
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We'll check in to see how those dinos are growing in size as we travel through time.
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But for now, let's see what's happening to Earth.
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During the Triassic period, the supercontinent Pangea starts to fragment, slowly altering global climates and ecosystems.
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The climate was generally hot and dry, and there were no polar ice caps, creating a stark contrast to what you're typically used to in modern-day Earth.
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The vegetation was also very different, and was crucial for the survival and evolution of dinosaurs.
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The plants have different characteristics as well.
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Some are tough, some nutritious, and others potentially poisonous.
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Each one of them will influence the dietary and adaptive strategies of different dinosaur species.
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Speaking of which, what are some other dinosaurs doing during this time?
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Weighing in at about 23 kg and 1 m tall, we have the Coelophysis.
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It was a little bit bigger than the Eoraptor, but that didn't stop it from being a fast and agile predator that likely preyed on smaller animals.
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Now the Herrerasaurus was slightly taller at about 1.1 meters, but was a lot heavier at about 350 kilograms.
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Then we have the Pladeosaurus.
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This guy is way bigger than me.
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It stood tall at about 3 meters and weighed up to 4,000 kg.
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This was one of the earliest examples of how big dinosaurs could grow.
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But wait, they get even bigger than this.
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Despite their impressive forms, dinosaurs weren't the dominant creatures during the Triassic.
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They had to share their environments with many other organisms, all vying for survival in the diverse ecosystems.
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This was the case until the Triassic period would experience a great extinction event.
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This was likely caused by massive volcanic activity, climate change, and potentially even some small asteroid impacts.
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This will have a significant effect on life on Earth and lead to the extinction of numerous species.
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But it wasn't all bad, especially for our dinosaurs.
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This moment set the stage to bring new opportunities to these species, leading to them dominating the Earth.
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Jurassic Period.
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Now, instead of dinosaurs simply surviving, this is where they thrive.
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Over the millions of years, different species have been evolving, and dinosaurs are now the rulers of the Earth.
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They spread across continents, dominating the lush forests and arid deserts.
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Occupying these areas were some massive dinosaurs, ones that you're probably a lot more familiar with.
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We have the Stegosaurus, Brachiosaurus and Allosaurus.
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These were some of the largest creatures ever to walk the Earth.
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But you'd quickly notice that it wasn't just these massive beasts that were roaming around.
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This era also saw the evolution of theropods.
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These were smaller dinosaurs that had more of a bird-like form.
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One of the most famous was the Archaeopteryx.
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It was kind of like a mix between a dinosaur and a bird, with feathers and wings, but also with bony teeth and a tail.
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The Archaeopteryx was a crucial link between birds and dinosaurs.
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If you wait about 100 million more years, they'll evolve into the birds we know today.
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Wait, is that a spoiler?
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After 56 million years, the Jurassic period comes to an end.
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This was after yet another extinction event happened.
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Luckily, this one is more minor.
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However, due to climate change, volcanic activity and sea levels changing, some species are going extinct.
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This once again changes the landscape as the dinosaurs enter their final era, Cretaceous Period.
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OK, we've now entered the Cretaceous Period.
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And as we've been traveling through these millions of years, you may have noticed something's missing.
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Right, one of the dinosaur's biggest stars hasn't appeared yet.
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Say hello to the Tyrannosaurus rex.
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The T-Rex was a massive beast.
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It was 3.7 meters tall and 12 meters long.
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Not only that, but it was a whopping 9 tons.
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Equipped with a powerful jaw and incredibly sharp teeth, the T-Rex dominated the Cretaceous Kingdom.
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It was one of the most dominant predators history has ever seen.
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This colossal beast wasn't just scavenging leftovers.
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It was an active hunter, stalking its prey with keen eyesight and a heightened sense of smell.
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Among its favorite meals were the sizable herbivores like the Edmontosaurus.
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But the T-Rex didn't stop there.
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It would take on formidable opponents like the Triceratops and even other smaller theropods if the opportunity arose.
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With its powerful jaws filled with 12-inch teeth, and its strong hind limbs that allowed it to run at speeds of up to 40 km per hour,
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the T-Rex was a master of the hunt.
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But this period wasn't just filled with massive beasts like the T-Rex.
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Look around, and you'll also notice even more feathered dinosaurs in the Cretaceous period.
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One of them being the Velociraptor.
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Now, you typically see them portrayed like this, with no feathers, but evidence suggests that these creatures were quite feathered.
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Now, the feathers weren't necessarily used for flying, more for warmth and stability.
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And this one is the Microraptor.
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Now, unlike the Velociraptor, its feathers likely were used for flight, giving us crucial insight into the evolution of birds.
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Okay, as I mentioned earlier, Pangea was breaking up and forming into the continents we know today.
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But because of this, some dinosaurs were forced to migrate and separate into different areas of the world.
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These dinosaurs had to adapt to their new environments, potentially changing the course of their evolution.
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But none of this matters when we consider what happens next.
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The cataclysmic event.
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Okay, as you've been hanging out with the dinosaurs for millions of years, an asteroid has been making its way toward Earth.
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Then suddenly, it hits, creating a massive crater 150 km wide and 20 km deep.
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Naturally, something this huge makes a devastating impact on the world, one that'll change it forever.
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The asteroid's collision is massive, but its impact is felt long after the initial crash.
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Due to the massive collision, the environment drastically changes.
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Significant drops in temperatures start to occur, and debris from the crash begins to block out the Sun.
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This impacts not only the dinosaurs' health, but also their food supply.
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This devastating event wipes out 75% of the Earth's species, many of which are the dinosaurs we've been observing this whole time.
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But don't worry, not all of the dinosaurs went extinct.
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The aviation-based dinosaurs we checked out earlier managed to survive the asteroid strike, eventually evolving into birds.
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Aftermath Now that most of the dinosaurs are extinct,
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it's cleared the way for mammals to diversify and expand their impact on the world.
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With less competition, early mammals can now thrive and take over, which slowly, over time, allowed humans to evolve,
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building the world we know today.
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Dinosaurs went on to evolve for another 165 million years, but there's still so much we need to learn about them.
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Like, did you know that not all dinosaurs were cold-blooded?
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Some of them may have been warm-blooded, or even both.
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But that's a story for another WHAT IF.
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível B2 usa o vídeo “Evolution of Dinosaurs in 10 Minutes”. As palavras que mais se repetem: dinosaur, period, massive, species, Earth. Este vídeo tem 105 frases e 1391 palavras para praticar shadowing. A fala dura 10:03. O falante mantém um ritmo estável de cerca de 138 palavras por minuto, confortável para o shadowing. Apenas 78% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.
Vocabulário principal deste vídeo
As 15 palavras mais avançadas do vídeo, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| dinosaur substantivo | /ˈdaɪnəsoɹ/ | dinossauro |
| evolve verbo | /ɪˈvɑlv/ | desenvolver, elaborar |
| feather substantivo | /ˈfɛðə/ | pluma, pena |
| meter substantivo | /ˈmitəɹ/ | contador |
| archosaur substantivo | arcossauro | |
| asteroid substantivo | /ˈæst(ə)ɹɔɪd/ | asteroide, planetoide |
| extinct adjetivo | /ɪkˈstɪŋkt/ | apagado, extinguido |
| extinction substantivo | /ɪkˈstɪŋkʃən/ | extinção |
| dominate verbo | /ˈdɑ.məˌneɪt/ | dominar |
| weigh verbo | /weɪ/ | pesar |
| devastate verbo | /ˈdɛv.ə.steɪt/ | devastar |
| kilogram substantivo | /ˈkɪləɡɹæm/ | quilograma, kilograma |
| mammal substantivo | /ˈmæməl/ | mamífero |
| theropod substantivo | /ˈθɪɚ.əˌpɑd/ | terópode |
| limb substantivo | /lɪm/ | membro |
Phrasal verbs que você vai ouvir
| Palavra | Significado |
|---|---|
| check out verbo | verificar, sacar só |
| take over verbo | tomar posse de, apoderar-se de |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Present perfect continuous have/has been + -ing — uma ação que começou antes e continua | have been evolving · we've been traveling · you've been hanging |
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | was likely caused · wasn't just filled · were forced |
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | we've now entered · hasn't appeared · has ever seen |
Pronúncia para ficar de olho
O falante usa 25 contrações e formas reduzidas, como wasn't, we've, you're. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “th”: feather /ˈfɛðə/, theropod /ˈθɪɚ.əˌpɑd/, thrive /θɹajv/, warmth /wɔɹmθ/, aftermath /ˈæf.tɚˌmæθ/
- Os sons de “sh” e “zh”: extinction /ɪkˈstɪŋkʃən/, collision /kəˈlɪʒn̩/, nutritious /nuːˈtɹɪʃəs/, vegetation /ˌvɛd͡ʒəˈteɪʃən/, evolutionary /ˌiː.vəˈluː.ʃən.ɛɹ.i/
- Palavras longas — acerte a sílaba tônica: ecosystem /ˈikoʊˌsɪstəm/, cataclysmic /ˌkætəˈklɪzmɪk/, diversify /daɪˈvɝ.sə.faɪ/, organism /ˈɔɹ.ɡəˌnɪz.əm/, formidable /ˈfɔɹmɪdəbəl/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: asteroid /ˈæst(ə)ɹɔɪd/, extinct /ɪkˈstɪŋkt/, dominate /ˈdɑ.məˌneɪt/, devastate /ˈdɛv.ə.steɪt/, theropod /ˈθɪɚ.əˌpɑd/
- /l/ final — a língua toca o céu da boca, não vira “u”: mammal /ˈmæməl/, bipedal /ˌbaɪˈpiːdəl/, colossal /kəˈlɑsəl/, crocodile /ˈkɹɑkədaɪl/, reptile /ˈɹɛp.taɪl/
- /h/ — um sopro suave, diferente do “r”: heighten /ˈhaɪ̯.tən/, herbivore /ˈ(h)ɜːɹbɪvɔːɹ/, whopping /ˈ(h)wɑpɪŋ/, hind /haɪnd/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Faça shadowing frase por frase na velocidade normal, repetindo cada uma até o seu ritmo ficar igual ao do falante.
- Grave a sua voz e compare com o original, prestando atenção a palavras como dinosaur, evolve, feather.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.