Pratique du Shadowing: How Radioactive Are Your Teeth? - Apprendre l'anglais à l'oral avec la vidéo
Création de la leçon...
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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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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « How Radioactive Are Your Teeth? ». Les mots qui reviennent le plus souvent : radioactive, nuclear, teeth, testing, weapons. Cette vidéo contient 25 phrases et 359 mots à répéter en shadowing. La partie parlée dure 2:15. Le locuteur parle à un rythme naturel d’environ 160 mots par minute, proche d’une conversation courante. Seuls 79 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| radioactive adjectif | /ˌɹeɪdioʊˈæktɪv/ | radioactif |
| nucleus nom | /ˈnuː.kli.əs/ | noyau |
| fallout nom | /ˈfɔlˌaʊt/ | retombées |
| detonate verbe | /ˈdɛtəneɪt/ | détoner |
| decay nom | /diˈkeɪ/ | décrépitude |
| accumulate verbe | /əˈkjuːmjʊˌleɪt/ | accumuler |
| dangerously adverbe | dangereusement | |
| escalate verbe | /ˈɛs.kə.leɪt/ | intensifier |
| fission nom | /ˈfɪʃən/ | fission, scissiparité |
| leukemia nom | /luːˈkiːmi.ə/ | leucémie, leucose |
| megaton nom | /ˈmɛɡəˌtʌn/ | mégatonne |
| mutate verbe | /ˈmju.teɪt/ | muter |
| pasture nom | /ˈpæst͡ʃəɹ/ | pâture, pâturage |
| radioactivity nom | /ˌreɪdɪəʊakˈtɪvɪti/ | radioactivité |
| thyroid adjectif | /ˈθaɪ.ɹɔɪd/ | thyroïde |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | were detonated · is given · have been detonated |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | have been detonated · has stopped |
Prononciation à surveiller
- Les sons « th »: thyroid /ˈθaɪ.ɹɔɪd/, altogether /ɔl.tuˈɡɛð.ɚ/
- Mots longs — placez bien l’accent: radioactive /ˌɹeɪdioʊˈæktɪv/, accumulate /əˈkjuːmjʊˌleɪt/, leukemia /luːˈkiːmi.ə/, radioactivity /ˌreɪdɪəʊakˈtɪvɪti/, atmospheric /ˌætməsˈfɛɹɪk/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme radioactive, nucleus, fallout.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.