Shadowing Practice: Can You Define Energy? - Learn English Speaking with Video
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Here's a question that sounds easy.
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What is energy?
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Go on, try it.
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Define it to a friend.
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You've said the word a thousand times.
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You've got energy after breakfast.
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A battery runs out of energy.
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The sun gives off energy.
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But if I asked you to point at energy, actually point at it, where would you point?
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You can't.
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And that's the strange part.
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Energy might be the most important idea in all of science, and nobody has ever seen it.
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Not once.
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Not with a microscope.
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Not with a telescope.
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Because energy isn't a thing.
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It's not stuff like water or air.
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You can't fill a jar with it.
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You can't put it on a scale and weigh it.
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Open a textbook and you'll find energy defined as the ability to do work or to make change.
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It doesn't tell you what energy is, it tells you what energy does.
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And that's the catch.
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We can't see energy, but we can see the changes it causes when it's converted from one form into another.
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Think about a campfire.
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There's a lot of air.
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Chemical potential energy is stored inside the wood, but a log just looks like a log.
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Then it burns, and that chemical energy converts into heat and light.
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You feel the warmth on your face.
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You see the glow.
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You're not seeing energy.
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You're seeing a conversion.
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A diver standing on a diving board may not appear to have energy energy, but their height gives them gravitational potential energy.
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The board stores elastic potential energy as it bends, then launches them upwards.
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As they fall, gravitational potential energy becomes kinetic energy.
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Energy transfers to the water, creating waves and sound.
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Every step of the way, you only notice the energy at the moment it changes form.
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Or look at a solar panel on a roof.
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Sunlight hits it, but nothing seems to happen.
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No noise, no moving parts.
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It just sits there.
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But inside the panel's photovoltaic cells, light energy is being converted into electrical energy.
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Now step inside the home and switch on a fan.
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Suddenly, the blades are spinning.
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That's electrical energy converting into kinetic energy.
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Light energy into electrical energy and then inside the house into many other forms.
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Kinetic energy in a fan, heat in a toaster, light and sound from a TV.
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So here's the sneaky bit.
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Scientists don't define energy by what it is, they define it by what it does.
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Textbooks say energy is the ability to make things happen, to move something, heat something, or light something up.
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That's true.
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But notice it describes the effects, not the thing itself.
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So that's why energy is so hard to define.
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We've never seen it, not once.
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We've only ever seen its footprints.
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Vocabulario y notas de pronunciación para esta lección
Este vídeo tiene 54 frases y 464 palabras para practicar shadowing. La parte hablada dura 3:20. El hablante mantiene un ritmo constante de unas 139 palabras por minuto, cómodo para el shadowing. El 84 % de las palabras está entre las 3.000 más comunes del inglés; conviene repasar el resto antes de empezar.
Vocabulario clave de este vídeo
15 palabras del vídeo que vale la pena aprender, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| define verbo | /dɪˈfaɪn/ | determinar, definir |
| convert verbo | /kənˈvɝt/ | convertir |
| textbook sustantivo | /ˈtɛkst.bʊk/ | manual, libro escolar |
| spin verbo | /spɪn/ | girar, rotar |
| conversion sustantivo | /kənˈvɝʒən/ | conversión |
| scientist sustantivo | /ˈsaɪəntəst/ | científico, científica |
| blade sustantivo | /bleɪd/ | cuchilla, hoja |
| bend verbo | /bɛnd/ | cimbrar, cimbrear |
| dive verbo | /daɪv/ | bucear, somorgujar |
| weigh verbo | /weɪ/ | pesar |
| glow verbo | /ɡloʊ/ | fulgir, fulgurar |
| sunlight sustantivo | /ˈsʌnˌlaɪt/ | luz del sol, luz solar |
| warmth sustantivo | /wɔɹmθ/ | calidez |
| telescope sustantivo | /ˈtɛl.əˌskoʊp/ | telescopio, catalejo |
| upwards adverbio | /ˈʌpwɚdz/ | hacia arriba, arriba |
Phrasal verbs que vas a escuchar
| Palabra | Pronunciación | Significado |
|---|---|---|
| give off verbo | /ɡɪv ɒf/ | emitir, desprender |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | You've said · has ever seen · We've never seen |
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | is stored · being converted |
Pronunciación a tener en cuenta
El hablante usa 14 contracciones y formas reducidas, como can't, we've, you're. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: conversion /kənˈvɝʒən/, gravitational /ˌɡɹævɪˈteɪʃənəl/
- Palabras largas — cuida el acento: electrical /ɪˈlɛktɹɪkəl/, gravitational /ˌɡɹævɪˈteɪʃənəl/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Haz shadowing frase por frase a velocidad normal, repitiendo cada una hasta que tu ritmo coincida con el del hablante.
- Grábate y compara con el original, prestando atención a palabras como define, convert, textbook.
¿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.