Pratica di Shadowing: How is glass made? - Impara a parlare inglese con i video
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72 frasi
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1
Hi, it's Doug.
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I recently came across this unbelievable video.
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It was taken at a hotel in Texas where on the roof of the hotel they have this pool
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that hangs off the edge and it has a glass bottom.
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Look at this.
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Would you go in there?
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Would you trust this glass?
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Someone named Benjamin has a question about glass.
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Let's give him a call now.
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Hi, Doug.
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Hi, Benjamin.
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I have a question for you.
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How is glass made?
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That's a great question.
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It's funny, right?
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Think about just how many objects around you are made of glass.
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Without glass, we'd have no windows, no windshields for our cars, no No drinking glasses or eyeglasses.
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No skyscrapers or smartphones.
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And yet, it's really not obvious at all where glass comes from.
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Like if you're sitting there and you have a table or a desk in front of you like this, that's wood.
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I'm guessing you know that wood comes from a tree.
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Or this statue here is carved from stone.
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You know where that comes from. But glass?
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Glass is a material that has to be made.
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How do they make it?
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Where does it come from?
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Before I say anything more, now would be a good time to pause the video and discuss.
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Okay, you ready?
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Well, believe it or not, Glass is made by taking a bunch of sand and getting it so hot that it melts.
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It's one of the most amazing things to watch how it's made because in order to melt sand, you have to use a special type of oven that can get super hot.
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It's called a furnace or a kiln.
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Here you can see someone loading some sand into the furnace.
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Once it gets hot enough, it will melt or become liquid.
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And when you get something this hot, you can see it glows, just like lava.
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This isn't lava though, it's molten sand.
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And as it cools, it will start to look more familiar to you.
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It becomes solid glass.
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To make a flat sheet of glass, like you'd use for a window, they melt sand until it's molten.
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Then they pour it out and roll it into a flat shape like this, and carefully allow it to cool.
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More fancy objects, like a glass vase, are even more fun to watch.
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This involves a special skill called glass blowing.
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You can see here, it starts with this person taking a big glob of molten sand
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and getting it on the end of a hollow pipe.
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Then she blows air into the pipe.
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You can actually blow a bubble into it, which might end up being the open part of the vase.
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The molten glass has a similar thickness as honey.
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They carefully shape it the way they want it and keep turning it and turning it.
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As it cools, it becomes solid.
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Artists can make amazing sculptures with glass.
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Believe it or not, this artist is making a glass swan.
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So that's how glass is made.
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But it's kind of weird, isn't it?
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I mean, how did people ever discover that if you melt sand, it makes glass?
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We've been making glass for a long time.
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So long ago now that no one knows for sure who was the first person to discover
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that if you melt sand it makes glass.
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But some of the earliest objects made of glass come from ancient Egypt, a place covered in desert sand.
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Could it be that someone long ago had a campfire
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and noticed that the heat of their fire melted the sand beneath it?
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No one knows for sure, but it's possible.
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That's all for this week's question.
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Thanks Benjamin for asking it.
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Now for the next episode, there's a lunar eclipse that's going to happen.
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I reached into my question jar and chose three questions about lunar eclipses that I'm thinking about answering.
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When this video is done playing, you'll get to vote on one.
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You can choose from, what's the difference between a solar and lunar eclipse?
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Why does the moon turn blood red during a lunar eclipse?
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Or where does the word eclipse come from?
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So submit your vote when the video's over.
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I wanna hear from all of you watching.
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There are mysteries all around us.
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Stay curious and see you next week.
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Vocabolario e note di pronuncia per questa lezione
Questa lezione di conversazione di livello B1 si basa sul video “How is glass made?”. Le parole che ritornano più spesso: glass, sand, melt, eclipse, molten. Questo video contiene 72 frasi e 728 parole da ripetere con lo shadowing. Il parlato dura 4:28. Chi parla ha un ritmo naturale di circa 163 parole al minuto, vicino a una conversazione quotidiana. Il 82% delle parole rientra nelle 3.000 più comuni dell’inglese; conviene studiare le altre prima di iniziare. 14 delle sue 72 frasi sono domande: un buon esercizio per l’intonazione interrogativa e le risposte brevi.
Vocaboli chiave di questo video
Le 15 parole più avanzate del video, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| melt verbo | /mɛlt/ | sciogliere, fondere |
| eclipse sostantivo | /ɪˈklɪps/ | eclisse, eclissi |
| lunar aggettivo | /ˈlunɚ/ | lunare |
| vase sostantivo | /veɪ̯s/ | vaso |
| furnace sostantivo | /ˈfɝnɪs/ | caldaia, bruciatore |
| lava sostantivo | /ˈlɑvə/ | lava |
| pipe sostantivo | /ˈpaɪp/ | cornamusa |
| skyscraper sostantivo | /ˈskaɪˌskɹeɪpɚ/ | grattacielo |
| windshield sostantivo | /wɪnˈʃiːld/ | parabrezza |
| thickness sostantivo | /ˈθɪknəs/ | spessore, grossezza |
| swan sostantivo | /swɑn/ | cigno |
| glow verbo | /ɡloʊ/ | brillare |
| sculpture sostantivo | /ˈskʌlpt͡ʃɚ/ | scultura |
| hollow aggettivo | /ˈhɑloʊ/ | cavo |
| pause sostantivo | /pɔːz/ | pausa |
I phrasal verb che sentirai
| Parola | Significato |
|---|---|
| come across verbo | dare l'impressione, avere l'aria |
| end up verbo | andare a finire, finire |
Frasi da ripetere
Frasi brevi e complete del video che puoi riutilizzare nella conversazione di tutti i giorni:
- Would you go in there?
- Would you trust this glass?
- Let's give him a call now.
- We've been making glass for a long time.
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Forma passiva be + participio passato — conta ciò che accade, non chi lo fa | was taken · are made · is carved |
| Superlativi the -est / the most … — il massimo o il minimo di un gruppo | the most amazing · the earliest |
| Present continuous am/is/are + -ing — qualcosa che succede adesso o in questo periodo | you're sitting · I'm guessing · is making |
| Futuro con “will” will + verbo — una decisione, una promessa o una previsione | will melt · will start · you'll get |
Pronuncia a cui fare attenzione
Chi parla usa 10 contrazioni e forme ridotte, come I'm, isn't, wanna. Pronunciale nella forma breve, così come le senti.
- I suoni “th”: thickness /ˈθɪknəs/, beneath /bɪˈniːθ/
I suoni difficili per chi parla italiano:
- Consonante finale — senza aggiungere una vocale dopo: melt /mɛlt/, eclipse /ɪˈklɪps/, vase /veɪ̯s/, furnace /ˈfɝnɪs/, pipe /ˈpaɪp/
- /æ/ — più aperta della “e”: campfire /ˈkæmpˌfaɪ̯ɚ/, eyeglass /ˈaɪˌɡlæs/, statue /ˈstæt͡ʃu/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Inizia a velocità 0,75×, fai shadowing frase per frase e torna alla velocità normale quando diventa facile.
- Registrati e confronta con l’originale, facendo attenzione a parole come melt, eclipse, lunar.
Cos'è la tecnica dello Shadowing?
Shadowing è una tecnica di apprendimento delle lingue supportata da studi scientifici, originariamente sviluppata per la formazione dei traduttori professionisti e resa popolare dal poliglotta Dr. Alexander Arguelles. Il metodo è semplice ma potente: ascolti un audio in inglese di madrelingua e lo ripeti immediatamente ad alta voce — come un'ombra che segue il parlante con un ritardo di solo 1–2 secondi. A differenza dell'ascolto passivo o degli esercizi di grammatica, lo shadowing costringe il tuo cervello e i muscoli della bocca a elaborare e riprodurre simultaneamente i modelli di discorso reale. La ricerca dimostra che migliora significativamente la precisione della pronuncia, l'intonazione, il ritmo, il discorso connesso, la comprensione dell'ascolto e la fluidità del parlato — rendendolo uno dei metodi più efficaci per la preparazione alla prova di speaking dell'IELTS e per la comunicazione reale in inglese.