Prática de Shadowing: Four Places We Might Find Aliens - Aprenda a falar inglês com vídeo

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We don't actually know if aliens exist, but if they do, their cells probably have a special type of membrane.
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And that knowledge alone tells us where we can look for them, and maybe even what they'll be like.
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Hi, I'm David, and this is MinuteEarth.
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There are lots of different ways scientists can search for life on other planets.
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They can listen for radio signals from alien civilizations.
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They can scan distant atmospheres for the chemical fingerprints life leaves behind.
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And they can send spacecraft to sample places in our own solar system where life might be hiding.
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Or they can search for places that have the right conditions for a particular type of membrane to form.
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This last one is actually a pretty powerful tool for zeroing in on possible extraterrestrial life,
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because virtually every cell on Earth is wrapped in a membrane that keeps its contents inside,
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builds up a gradient by piling charged particles on one side, and then captures energy as those particles flow back through to the other.
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These membranes, we can call them electrochemical membranes, are so fundamental to life that many experts think that extraterrestrial life will likely have them too.
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On Earth, electrochemical membranes are formed from a specific set of elements, carbon, hydrogen, oxygen, nitrogen, and phosphorus, which can form molecules that,
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in the presence of liquid water, assemble into, well, membranes.
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And those membranes in turn form the foundation of life on Earth.
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So one way to find extraterrestrial life is to look for other worlds
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that have those same elements and the liquid water
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that would allow them to self -assemble and some sort of energy to power the life forms.
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And there are two of those worlds relatively nearby.
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Saturn's moon Enceladus has all of those elements and liquid water, though the ocean is buried under a thick shell of ice.
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So the membranes crucial to life could potentially form on Enceladus.
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But without direct sunlight, there's not much energy available.
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Any life
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that formed there would likely have to rely on the trickle of energy coming from hydrothermal vents on the ocean floor.
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So I imagine that any life there would be small and live right next to those vents.
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Jupiter's moon Europa also has all five of those membrane -building elements and a liquid ocean under an icy shell.
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But unlike energy -poor Enceladus, Europa is constantly being bombarded by radiation from Jupiter,
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and experiences much more tidal heating as it gets pushed and pulled by the massive planet.
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So if there is life on Europa, perhaps it's faster moving because it has more access to that energy.
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And then there's K2 -18b, a planet about 120 light -years away from us.
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From spectroscopy, we're pretty sure that it has at least three of the required elements to build
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Earth -like electrochemical membranes, and it may even have liquid water.
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But it's also surrounded by a thick layer of hydrogen gas, which for complicated chemistry reasons,
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some scientists speculate would lead not to the development of lots of individual membranes, but instead one big one.
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So that makes me envision alien life on K2 -18b that's not multiple organisms, but instead a single giant film that covers the entire world.
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And life may not actually be limited to worlds with exact
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Earth -like chemistry, because scientists think that in some cases, electrochemical membranes might be able to form from slightly different ingredients.
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The clouds surrounding
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Venus, for example, have no liquid water.
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So Earth -like membranes couldn't form there.
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And even if they did, the clouds are made of concentrated sulfuric acid, which would destroy those membranes on contact.
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What scientists have discovered, though, is that electrochemical membranes built with sulfur can actually self -assemble and survive in strong acid.
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So any life on Venus would probably have to form inside droplets of sulfuric acid.
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And because those droplets would have access to plenty of energy from sunlight as they floated up and down in the clouds,
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I picture excited aliens bopping around in their little acid bubbles.
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Again, we still don't know whether aliens exist.
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But focusing on the likelihood that they'll have electrochemical membranes doesn't just tell us where to look.
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It also hints that whatever we find could be deeply weird.

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Vocabulário e dicas de fala para esta lição

Esta aula de conversação usa o vídeo “Four Places We Might Find Aliens”. As palavras que mais se repetem: membrane, energy, electrochemical, liquid, Earth. Este vídeo tem 48 frases e 718 palavras para praticar shadowing. A fala dura 3:25. O falante fala rápido, cerca de 210 palavras por minuto, então espere sons ligados e reduzidos. Apenas 79% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.

Vocabulário principal deste vídeo

15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:

PalavraPronúnciaSignificado
liquid substantivo/ˈlɪk.wɪd/líquido
element substantivo/ˈɛləmənt/fundamento
acid substantivo/ˈæsɪd/ácido
scientist substantivo/ˈsaɪəntəst/cientista
membrane substantivo/ˈmɛm.bɹeɪn/membrana
cloud substantivo/ˈklaʊ̯d/nuvem, nimbo
assemble verbo/əˈsɛm.bəl/montar, juntar
thick adjetivo/θɪk/espesso, grosso
shell substantivo/ʃɛl/concha
chemistry substantivo/ˈkɛm.ɪ.stɹi/química
hydrogen substantivo/ˈhaɪdɹəd͡ʒ(ə)n/hidrogênio, hidrogénio
particle substantivo/ˈpɑɹtək(ə)l/partícula
sunlight substantivo/ˈsʌnˌlaɪt/luz do sol
vent substantivo/vɛnt/respiradouro
surround verbo/səˈɹaʊnd/contornar, cercar

Pronúncia para ficar de olho

O falante usa 8 contrações e formas reduzidas, como don't, they'll, couldn't. Diga-as na forma curta, do jeito que você ouve.

  • Os sons de “sh” e “zh”: shell /ʃɛl/, capture /ˈkæp.(t)ʃɚ/, potentially /pəˈtɛnʃ(ə)li/, crucial /ˈkɹuː.ʃəl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/
  • Palavras longas — acerte a sílaba tônica: complicated /ˈkɑm.plɪˌkeɪ.tɪd/, potentially /pəˈtɛnʃ(ə)li/, fundamental /ˌfʌn.dəˈmɛn.təl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, virtually /ˈvɚ.t͡ʃə.wə.li/

Sons difíceis para falantes de português:

  • Consoante final — sem acrescentar um “i” depois: liquid /ˈlɪk.wɪd/, element /ˈɛləmənt/, acid /ˈæsɪd/, scientist /ˈsaɪəntəst/, cloud /ˈklaʊ̯d/
  • /l/ final — a língua toca o céu da boca, não vira “u”: assemble /əˈsɛm.bəl/, shell /ʃɛl/, particle /ˈpɑɹtək(ə)l/, fundamental /ˌfʌn.dəˈmɛn.təl/, crucial /ˈkɹuː.ʃəl/
  • /h/ — um sopro suave, diferente do “r”: hydrogen /ˈhaɪdɹəd͡ʒ(ə)n/, hint /hɪnt/, likelihood /ˈlaɪklihʊd/

Como praticar com este vídeo

  1. Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
  2. Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
  3. Grave a sua voz e compare com o original, prestando atenção a palavras como liquid, element, acid.

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.

Técnica de shadowing: leia o guia completo passo a passo →