Pratique du Shadowing: Cell vs. virus: A battle for health - Shannon Stiles - Apprendre l'anglais à l'oral avec YouTube

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You're in line at the grocery store when,
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You're in line at the grocery store when,
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uh-oh, someone sneezes on you.
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The cold virus is sucked inside your lungs and lands on a cell on your airway lining.
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Every living thing on Earth is made of cells,
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from the smallest one-celled bacteria to the giant blue whale to you.
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Each cell in your body is surrounded by a cell membrane,
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a thick, flexible layer made of fats and proteins that surrounds and protects the inner components.
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It's semi-permeable, meaning that it lets some things pass in and out, but blocks others.
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The cell membrane is covered with tiny projections.
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They all have functions, like helping cells adhere to their neighbors or binding to nutrients the cell will need.
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Animal and plant cells have cell membranes,
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Apparently, plant cells have a cell wall,
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which is made of rigid cellulose that gives the plant structure.
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The virus that was sneezed into your lungs is sneaky.
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Pretending to be a friend,
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it attaches to a projection on the cell membrane,
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and the cell brings it through the cell membrane and inside.
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When the virus gets through,
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the cell recognizes its mistake.
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An enemy is inside.
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Special enzymes arrive at the scene and chop the virus to pieces.
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They then send one of the pieces back through the cell membrane,
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where the cell displays it to warn neighboring cells about the invader.
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A nearby cell sees the warning and immediately goes into action.
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It needs to make antibodies,
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proteins that will attack and kill the invading virus.
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This process starts in the nucleus.
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The nucleus contains our DNA,
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the blueprint that tells our cells how to make everything our bodies need to function.
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A certain section of our DNA contains instructions that tell our cells how to make antibodies.
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Enzymes in the nucleus find the right section of DNA,
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then create a copy of these instructions called messenger RNA.
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The messenger RNA leaves the nucleus to carry out its orders.
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The messenger RNA travels to a ribosome.
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There can be as many as 10 million ribosomes in a human cell,
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all studded along a ribbon-like structure called the endoplasmic reticulum.
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This ribosome reads the instructions from the nucleus.
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It takes amino acids and links them together one by one,
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creating an antibody protein that will go fight the virus.
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But before it can do that,
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the antibody needs to leave the cell.
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The antibody heads to the Golgi apparatus.
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Here it's packed up for delivery outside the cell,
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enclosed in a bubble made of the same material as the cell membrane.
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The Golgi apparatus also gives the antibody directions,
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telling it how to get to the edge of the cell.
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When it gets there, the bubble surrounding the antibody fuses to the cell membrane.
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The cell ejects the antibody,
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and it heads out to track down the virus.
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The leftover bubble will be broken down by the cell's lysosomes and its pieces recycled over and over again.
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Where did the cell get the energy to do all this?
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That's the role of the mitochondria.
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To make energy, the mitochondria takes oxygen,
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this is the only reason we breathe it,
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and adds electrons from the food we eat to make water molecules.
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That process also creates a high-energy molecule called ATP,
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which the cell uses to power all of its parts.
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Plant cells make energy a different way.
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They have chloroplasts that combine carbon dioxide and water with light energy from the sun to create oxygen and sugar,
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a form of chemical energy.
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All the parts of a cell have to work together to keep things running smoothly.
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And all the cells of your body have to work together to keep you running smoothly.
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That's a whole lot of cells.
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Scientists think there are about 37 trillion of them.
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you

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About This Lesson

In this lesson, you will practice your English listening and speaking skills through the engaging content presented in the video "Cell vs. virus: A battle for health" by Shannon Stiles. The transcript explores the fascinating world of cells and viruses, providing a unique opportunity to expand your vocabulary while learning about biological processes. You'll practice how to communicate complex ideas clearly and improve your pronunciation through shadowing techniques. As you master the content, you’ll become more confident in discussing scientific topics and enhancing your overall English speaking practice.

Key Vocabulary & Phrases

  • Cell membrane - the protective layer that surrounds a cell, controlling what enters and exits.
  • Antibody - a protein produced by the immune system to help fight off infectious agents like viruses.
  • Nucleus - the part of the cell containing DNA, which dictates how cells function.
  • Ribosome - a structure within the cell that synthesizes proteins by translating messenger RNA.
  • Mitochondria - the powerhouse of the cell, responsible for generating energy.
  • Golgi apparatus - the organelle that packages proteins for transport out of the cell.
  • Semipermeable - a property of cell membranes that allows certain substances to pass while blocking others.

Practice Tips

To get the most out of this lesson and improve your English skills, consider utilizing shadowing techniques as you engage with the video. Here are some tailored strategies:

  • Watch and Listen: First, watch the video without attempting to speak. Focus on understanding the content, especially the scientific terminology.
  • Pause and Repeat: Rewind the video often. After a sentence or a key phrase, pause it and repeat what you just heard. Try to mimic the speaker's intonation and speed.
  • Break it Down: If the video feels too fast, break it down into smaller sections. Shadow one sentence or a couple of phrases at a time, then gradually increase the amount you practice.
  • Record Yourself: Use a recording device to capture your shadow speech. Listen to your recordings and compare your pronunciation and fluency to the original. This will highlight areas for improvement.
  • Engage with the Material: Discuss the key vocabulary and concepts with fellow learners or friends. This real conversation practice will help solidify your understanding and use of the new terms.

By incorporating these methods into your routine, you'll not only learn English with YouTube but also enhance your ability to articulate scientific concepts clearly and effectively as you navigate your English speaking practice.

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.

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