Prática de Shadowing: How Radioactive Are Your Teeth? - Aprenda a falar inglês com vídeo
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How radioactive are your teeth?
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In the 1950s, American dentists collecting baby teeth found that they were dangerously radioactive and levels were rising every year.
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This is bad news.
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Radioactive teeth means radioactive bones.
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Where was all this radioactivity coming from?
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Not from their neighborhood, but nuclear weapons testing thousands of miles away.
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As tensions escalated in the Cold War, The United States and the Soviet Union designed increasingly powerful nuclear weapons, many of which were detonated on their own soil.
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Nuclear fission produces dozens of nuclei, most of which are radioactive themselves.
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Atmospheric tests at the Nevada test site carried radioactive debris east where it would fall out of the air onto pasture.
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Cows would eat this grass, making their milk slightly radioactive.
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When this milk is given to children, radioactive elements are built into bones and teeth, accumulate in the thyroid and are incorporated into every cell.
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When a radioactive nucleus decays in the body, it spits out high-energy particles, which break chemical bonds in cells,
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mutate DNA, and ultimately cause cancers like leukemia.
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And there were lots of tests.
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Altogether, over 2,000 nuclear weapons have been detonated, more than 500 of them above ground,
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spreading the radioactive fallout of 545 megatons of explosions.
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And there's no cleaning it up.
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This fallout is everywhere in the environment, causing cancers and potentially killing as many or more than the attacks on Hiroshima and Nagasaki.
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Ultimately, the discovery of radioactive teeth convinced the US and Soviet Union to sign the partial test ban treaty,
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so the good news is that above-ground testing mostly stopped during the Cold War, and the dangerous radioactive nuclei are slowly decaying away.
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But many of these nuclei have half-lives of decades to centuries, so even people born today, long after testing has stopped,
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may be killed by the fallout from last century's tests.
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While testing has mostly stopped, it could return unless the nuclear weapons states formally adopt a UN treaty to ban it.
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You have a choice.
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You can demand that the governments of the world ban nuclear testing and even nuclear weapons, or you can look in the mirror and ask yourself...
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível C1 usa o vídeo “How Radioactive Are Your Teeth?”. As palavras que mais se repetem: radioactive, nuclear, teeth, testing, weapons. Este vídeo tem 25 frases e 359 palavras para praticar shadowing. A fala dura 2:15. O falante fala em ritmo natural, cerca de 160 palavras por minuto, próximo de uma conversa do dia a dia. Apenas 79% 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 |
|---|---|---|
| radioactive adjetivo | /ˌɹeɪdioʊˈæktɪv/ | radioactivo, radioativo |
| nucleus substantivo | /ˈnuː.kli.əs/ | núcleo |
| fallout substantivo | /ˈfɔlˌaʊt/ | precipitação |
| detonate verbo | /ˈdɛtəneɪt/ | detonar, explodir |
| decay substantivo | /diˈkeɪ/ | deterioração, apodrecimento |
| accumulate verbo | /əˈkjuːmjʊˌleɪt/ | acumular |
| dangerously advérbio | perigosamente | |
| escalate verbo | /ˈɛs.kə.leɪt/ | intensificar |
| fission substantivo | /ˈfɪʃən/ | fissão |
| leukemia substantivo | /luːˈkiːmi.ə/ | leucemia |
| mutate verbo | /ˈmju.teɪt/ | mutar |
| pasture substantivo | /ˈpæst͡ʃəɹ/ | pasto, pastadouro |
| radioactivity substantivo | /ˌreɪdɪəʊakˈtɪvɪti/ | radioatividade |
| thyroid adjetivo | /ˈθaɪ.ɹɔɪd/ | tiroide |
| atmospheric adjetivo | /ˌætməsˈfɛɹɪk/ | atmosférico |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | were detonated · is given · have been detonated |
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | have been detonated · has stopped |
Pronúncia para ficar de olho
- Os sons de “th”: thyroid /ˈθaɪ.ɹɔɪd/, altogether /ɔl.tuˈɡɛð.ɚ/
- Palavras longas — acerte a sílaba tônica: radioactive /ˌɹeɪdioʊˈæktɪv/, accumulate /əˈkjuːmjʊˌleɪt/, leukemia /luːˈkiːmi.ə/, radioactivity /ˌreɪdɪəʊakˈtɪvɪti/, atmospheric /ˌætməsˈfɛɹɪk/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como radioactive, nucleus, fallout.
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.