Shadowing Practice: How Radioactive Are Your Teeth? - Learn English Speaking with Video
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1
How radioactive are your teeth?
2
In the 1950s, American dentists collecting baby teeth found that they were dangerously radioactive and levels were rising every year.
3
This is bad news.
4
Radioactive teeth means radioactive bones.
5
Where was all this radioactivity coming from?
6
Not from their neighborhood, but nuclear weapons testing thousands of miles away.
7
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.
8
Nuclear fission produces dozens of nuclei, most of which are radioactive themselves.
9
Atmospheric tests at the Nevada test site carried radioactive debris east where it would fall out of the air onto pasture.
10
Cows would eat this grass, making their milk slightly radioactive.
11
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.
12
When a radioactive nucleus decays in the body, it spits out high-energy particles, which break chemical bonds in cells,
13
mutate DNA, and ultimately cause cancers like leukemia.
14
And there were lots of tests.
15
Altogether, over 2,000 nuclear weapons have been detonated, more than 500 of them above ground,
16
spreading the radioactive fallout of 545 megatons of explosions.
17
And there's no cleaning it up.
18
This fallout is everywhere in the environment, causing cancers and potentially killing as many or more than the attacks on Hiroshima and Nagasaki.
19
Ultimately, the discovery of radioactive teeth convinced the US and Soviet Union to sign the partial test ban treaty,
20
so the good news is that above-ground testing mostly stopped during the Cold War, and the dangerous radioactive nuclei are slowly decaying away.
21
But many of these nuclei have half-lives of decades to centuries, so even people born today, long after testing has stopped,
22
may be killed by the fallout from last century's tests.
23
While testing has mostly stopped, it could return unless the nuclear weapons states formally adopt a UN treaty to ban it.
24
You have a choice.
25
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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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “How Radioactive Are Your Teeth?”. Las palabras que más se repiten: radioactive, nuclear, teeth, testing, weapons. Este vídeo tiene 25 frases y 359 palabras para practicar shadowing. La parte hablada dura 2:15. El hablante habla a un ritmo natural de unas 160 palabras por minuto, cercano a una conversación cotidiana. Solo el 79 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| radioactive adjetivo | /ˌɹeɪdioʊˈæktɪv/ | radiactivo |
| nucleus sustantivo | /ˈnuː.kli.əs/ | núcleo |
| fallout sustantivo | /ˈfɔlˌaʊt/ | lluvia, pluvia |
| detonate verbo | /ˈdɛtəneɪt/ | detonarse |
| decay sustantivo | /diˈkeɪ/ | descomposición, deterioración |
| accumulate verbo | /əˈkjuːmjʊˌleɪt/ | acumular |
| dangerously adverbio | peligrosamente | |
| escalate verbo | /ˈɛs.kə.leɪt/ | elevar a un nivel superior |
| fission sustantivo | /ˈfɪʃən/ | fisión |
| leukemia sustantivo | /luːˈkiːmi.ə/ | leucemia |
| mutate verbo | /ˈmju.teɪt/ | mutar |
| pasture sustantivo | /ˈpæst͡ʃəɹ/ | pasto, pradera |
| radioactivity sustantivo | /ˌreɪdɪəʊakˈtɪvɪti/ | radioactividad |
| thyroid adjetivo | /ˈθaɪ.ɹɔɪd/ | tiroides |
| atmospheric adjetivo | /ˌætməsˈfɛɹɪk/ | atmosférico |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | were detonated · is given · have been detonated |
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | have been detonated · has stopped |
Pronunciación a tener en cuenta
- Los sonidos de “th”: thyroid /ˈθaɪ.ɹɔɪd/, altogether /ɔl.tuˈɡɛð.ɚ/
- Palabras largas — cuida el acento: radioactive /ˌɹeɪdioʊˈæktɪv/, accumulate /əˈkjuːmjʊˌleɪt/, leukemia /luːˈkiːmi.ə/, radioactivity /ˌreɪdɪəʊakˈtɪvɪti/, atmospheric /ˌætməsˈfɛɹɪk/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como radioactive, nucleus, fallout.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.