Pratica di Shadowing: Parts of a Microscope & How to Use a Microscope - Impara a parlare inglese con i video
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in this video we're going to learn about microscopy which just means the use of microscopes
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so we'll cover what a microscope is what the terms object image and magnification mean
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the different parts of a light microscope and finally how to use a light microscope To start off,
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we need to know what a microscope is.
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So a microscope is a tool that we use in science to make things look much larger than they actually are, and so help us see tiny details.
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For example, we often use microscopes in biology to look at cells, which we can't see with the naked eye, but can see with a microscope.
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before we go any further we need to introduce the terms object
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and image in microscopy the term object refers to the real object
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or the sample that you're looking at so
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if we had some onion cells on our microscope slide then these cells themselves would be the object
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the term image on the other hand refers to the image that we see when we look down the microscope
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for example if we were to look down this microscope we might see something like this
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so this would be our image whereas the object is the actual onion cells on the microscope slide
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that we're looking at this brings us nicely to the next term you need to know magnification
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which we can define as how many times larger the image is than the object
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So if the image appeared 1 ,000 times larger than the object, then the magnification would be times 1 ,000.
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Next, let's move on to look at the different parts of a light microscope.
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Supporting the whole thing is the base at the bottom, and then the arm that connects the bottom to the top.
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Then we have some kind of light source, which on some microscopes would be a lamp, But in this case, it's just a mirror reflecting the light from the room.
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And just above it is the stage, which is where we put our microscope slide.
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Then in the top half, we have all of our lenses.
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So we normally have three objective lenses, which we can choose between, and each have different magnifications.
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And then also an eyepiece lens, which has a fixed magnification.
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And sits just below where we look into the microscope.
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Then the last things to notice are the body tube here
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and the coarse and fine focusing knobs which we can turn to help us get the image in focus.
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The last thing we need to cover are the main steps of how to use a light microscope.
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First, we need to set up the microscope near a window
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or a lamp to make sure there's enough light and angle the mirror to direct the light upwards.
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This will reflect the light up through the hole in the stage.
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We then need to take our specimen
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which is the scientific word for whatever it is you'll be looking at
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and place it on a thin glass plate called a slide.
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Next we take our slide with the specimen on, place it onto the stage and secure it.
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This means we put it just here so the light reflected shines through the specimen and up through the microscope.
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Now that our slide is in place, we can look through the eyepiece lens and adjust the focus.
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So first we turn the coarse focus knob to get a rough image
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and then we can turn the fine focus knob to fine
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-tune it until we have a clear magnified view of our
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specimen finally this part here where the objective lenses are can
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rotate to switch to an objective lens with a higher magnification
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then you can adjust the focus again to bring the specimen back into clear view
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if you haven't heard yet you can find all of our videos on our website cognito .org You'll also find questions,
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flashcards, exam -style questions, and past papers.
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And we track all of your progress so that you always know what to study next.
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So sign up for free by clicking here or browse our playlist here on YouTube.
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Vocabolario e note di pronuncia per questa lezione
Questo video contiene 46 frasi e 698 parole da ripetere con lo shadowing. Il parlato dura 4:40. Chi parla mantiene un ritmo costante di circa 149 parole al minuto, comodo per lo shadowing. Il 84% delle parole rientra nelle 3.000 più comuni dell’inglese; conviene studiare le altre prima di iniziare.
Vocaboli chiave di questo video
15 parole del video che vale la pena imparare, con pronuncia e significato:
| Parola | Pronuncia | Significato |
|---|---|---|
| microscope sostantivo | /ˈmaɪ.kɹəˌskoʊp/ | microscopio |
| slide sostantivo | /ˈslaɪ̯d/ | scivolo |
| lens sostantivo | /lɛnz/ | lentille, lente |
| specimen sostantivo | /ˈspɛsɪmɪn/ | esemplare |
| reflect verbo | /ɹɪˈflɛkt/ | riflettere |
| objective sostantivo | /ɒbˈd͡ʒɛk.tɪv/ | obiettivo |
| mirror sostantivo | /ˈmiɹɚ/ | specchio |
| refer verbo | /ɹɪˈfɜː/ | riferire |
| adjust verbo | /əˈd͡ʒʌst/ | adattare, adeguare |
| lamp sostantivo | /ˈlæ̝mp/ | lampada, lampadina |
| onion sostantivo | /ˈʌn.jən/ | cipolla |
| thin aggettivo | /ˈθɪn/ | sottile, fine |
| naked aggettivo | /ˈneɪkɪd/ | nudo, ignudo |
| whereas | /(h)wɛɹˈæz/ | laddove, mentre |
| angle sostantivo | /ˈæŋ.ɡəl/ | angolo |
I phrasal verb che sentirai
| Parola | Pronuncia | Significato |
|---|---|---|
| set up verbo | /ˌsɛt ˈʌp/ | preparare, installare |
La grammatica di questo video
Le strutture che chi parla usa di più, con le parole esatte del video:
| Struttura | Nel video |
|---|---|
| Frasi relative who / which + frase — un’informazione in più su una persona o una cosa | stage, which is · lens, which has |
| Comparativi -er than / more … than — confrontare due cose | larger than |
| Obbligo: must / have to / need to dire che qualcosa è necessario | need to know · need to introduce · need to cover |
| Futuro con “will” will + verbo — una decisione, una promessa o una previsione | we'll cover · will reflect · you'll be |
Pronuncia a cui fare attenzione
Chi parla usa 8 contrazioni e forme ridotte, come we're, you'll, can't. Pronunciale nella forma breve, così come le senti.
- I suoni “sh” e “zh”: examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, shine /ʃaɪn/, magnification /ˌmæɡnɪfɪˈkeɪʃən/, flashcard /ˈflæʃˌkɑɹd/
- Parole lunghe — attenzione all’accento: examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, biology /baɪˈɑ.lə.d͡ʒi/, magnification /ˌmæɡnɪfɪˈkeɪʃən/, microscopy /maɪˈkɹɑ.skə.pi/
Come esercitarsi con questo video
- Ascolta tutto il video una volta senza parlare e annota le parole che non conosci.
- Fai shadowing frase per frase a velocità normale, ripetendo ognuna finché il tuo ritmo coincide con quello di chi parla.
- Registrati e confronta con l’originale, facendo attenzione a parole come microscope, slide, lens.
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.