Pratique du Shadowing: Parts of a Microscope & How to Use a Microscope - Apprendre l'anglais à l'oral avec la vidéo
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46 phrases
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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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Vocabulaire et conseils d’expression pour cette leçon
Cette vidéo contient 46 phrases et 698 mots à répéter en shadowing. La partie parlée dure 4:40. Le locuteur parle à un rythme régulier d’environ 149 mots par minute, confortable pour le shadowing. 84 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| microscope nom | /ˈmaɪ.kɹəˌskoʊp/ | microscope |
| slide nom | /ˈslaɪ̯d/ | toboggan, glissoire |
| lens nom | /lɛnz/ | lentille |
| specimen nom | /ˈspɛsɪmɪn/ | spécimen, exemple |
| reflect verbe | /ɹɪˈflɛkt/ | refléter, réfléchir |
| objective nom | /ɒbˈd͡ʒɛk.tɪv/ | objectif, but |
| mirror nom | /ˈmiɹɚ/ | glace, miroir |
| refer verbe | /ɹɪˈfɜː/ | référer |
| adjust verbe | /əˈd͡ʒʌst/ | ajuster |
| lamp nom | /ˈlæ̝mp/ | lampe |
| onion nom | /ˈʌn.jən/ | oignon, ognon |
| thin adjectif | /ˈθɪn/ | mince |
| naked adjectif | /ˈneɪkɪd/ | nu |
| whereas | /(h)wɛɹˈæz/ | tandis que, alors que |
| angle nom | /ˈæŋ.ɡəl/ | angle |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| set up verbe | /ˌsɛt ˈʌp/ | mettre en place, installer |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Propositions relatives who / which + proposition — une précision sur une personne ou une chose | stage, which is · lens, which has |
| Comparatifs -er than / more … than — comparer deux éléments | larger than |
| Obligation : must / have to / need to dire qu’une chose est nécessaire | need to know · need to introduce · need to set |
| Futur avec « will » will + verbe — une décision, une promesse ou une prédiction | we'll cover · will reflect · you'll be |
Prononciation à surveiller
Le locuteur utilise 8 contractions et formes réduites, comme we're, you'll, can't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, shine /ʃaɪn/, magnification /ˌmæɡnɪfɪˈkeɪʃən/, flashcard /ˈflæʃˌkɑɹd/
- Mots longs — placez bien l’accent: examination /ɪɡˌzæm.ɪˈneɪ.ʃən/, biology /baɪˈɑ.lə.d͡ʒi/, magnification /ˌmæɡnɪfɪˈkeɪʃən/, microscopy /maɪˈkɹɑ.skə.pi/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme microscope, slide, lens.
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.