跟读练习: The Ebola Virus Explained — How Your Body Fights For Survival - 通过视频学习英语口语

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What makes Ebola so dangerous?
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How can a virus overwhelm the very complex defense system of the body so quickly and so effectively?
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Let's take a look at what Ebola does.
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(Theme music) Ebola is a virus.
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A virus is a very small thing.
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A bit of RNA or DNA and a few proteins and a hull.
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It has no ability to do anything by itself whatsoever, and can only survive and proliferate by infecting cells.
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To avoid this we have the immune system.
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The immune system is super complex so we develop a visual system that makes it easy to understand.
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So it looks like this: Let's concentrate on the part that is critical to understanding Ebola and ignore the rest.
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So usually dendritic cells will activate the army of anti-virus cells, support cells and anti-body factories that work together with the guard cells wipe out the infection in a matter of days.
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But when Ebola strikes, it directly attacks the immune system.
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Some of the first cells it takes over are the dendritic cells, the brains of the immune system.
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The Ebola virus enters a dendritic cell by binding into receptors for cell transport.
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Once it is inside, it dissolves its outer hull and releases its genetic material, nucleoproteins and enzymes.
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In a nutshell it takes over the cell, disables the cells protective mechanisms and reprograms it.
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The cell now becomes a virus production machine and uses its resources to build Ebola viruses.
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Once the cell is saturated, it dissolves the cell membrane and millions of viruses are released into the tissue.
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The virus not only prevents the dendritic cells from activating the specialized and anti-virus forces, it manipulates them into sending signal proteins that tricks specialized cells into ending their own life's prematurely.
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So the immune system is seriously disrupted and unable to react.
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When the virus rapidly multiplies, we're talking billions, there are cells that should deal with infected cells, the natural killer cells, but they also get infected and just die before they can prevent the disease from spreading.
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At the same time Ebola infects the guard cells of the body macrophages and monocytes, not only managing to circumvent their defenses, it also manipulates some to signal to the cells make up the blood vessels telling into release fluid into the body Usually this makes sense, but in this case it just causes mayhem.
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All of the body's neutrophils are activated awaken by the virus and the macrophages signals then are not very effective against viruses and should not be involve in this fight and begin to do lots of stuffs they shouldn't do.
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The neutrophils signals to the blood vessels to release more fluid causing internal bleeding.
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Another area of the body Ebola attacks is the liver. The virus finds it very easy to enter the liver and it quickly starts killing loads of liver cells and causing organ failure and more internal bleeding.
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And all those things are going on at the same time.
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As the virus spreads, it's like nukes exploding every where.
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One incident of this in one region will be problem enough But now is starting to happen everywhere at once.
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All the mechanisms of the immune system have evolve to handle infections work against you.
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And the virus continues to spread and spread.
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And finally begins to infect more and more body cells while the body desperately struggles to stay alive.
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In a desperate last effort to turn the tide the immune system launches a cytokine storm.
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A cytokine storm is an S.O.S signal that causes the immune system to launch all of its weapons, all at once in a desperate kamikaze attack.
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This hurts the virus but leaves behind tons of collateral damage, Especially in the blood vessels.
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Paradoxically the healthier the immune system, the more damage it can do to itself More and more fluid leaves the blood stream.
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Blood pours after every opening of the body.
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You become seriously dehydrated that just not now blood left to supply the organs with oxygen and cells begin to die. If you reach this point the chance of you dying is very high.
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Currently six out of ten infected die from Ebola.
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Wow! Ok. Ebola is nasty. So it’s time to panic, right?
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No, not even close.
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The severity of Ebola gets paper sold and YouTube videos shared so everybody is talking about Ebola.
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But currently the only way to get infected by Ebola is to come into contact with the body fluids of a person who shows symptoms Or from infected bat. So just don’t do that.
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Ebola has killed 5,000 people since June 2014.
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The common flu kills up to 500,000 people each year.
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Malaria causes up to one million each year.
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3,000 people every single day. Ten children since this video started.
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So even if Ebola is terrible and scary, don’t let yourself be scared. The most infectious thing about Ebola is the media hype around it.
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You could learn a bit more about the immune system though Transcription made by Miriam Delgado Subtitles by the Amara .org community Revised by: Ace Ervite

关于本课

在本课中，学习者将通过观看关于埃博拉病毒的视频，深入理解人体的免疫系统以及它是如何与病毒作斗争的。通过分析视频中的讲解，学习者将会掌握相关的医学和生物学术语，同时增强他们的英语听说能力。我们将专注于如何利用 看YouTube学英语 的方式，提升发音和表达能力。

关键词汇与短语

  • 病毒 (virus) - 指一种微小的生物，需寄生在细胞内才能繁殖。
  • 免疫系统 (immune system) - 人体防御感染的复杂机制。
  • 树突细胞 (dendritic cells) - 免疫系统中的重要细胞，负责激活免疫反应。
  • 细胞凋亡 (apoptosis) - 细胞的程序性死亡，有时是免疫反应的一部分。
  • 细胞因子风暴 (cytokine storm) - 免疫系统过度反应，导致对身体的伤害。
  • 内脏出血 (internal bleeding) - 在体内发生的出血，可能由于免疫系统失调引起。
  • 再编程 (reprogramming) - 病毒如何操纵细胞的功能。
  • 流体释放 (fluid release) - 身体向血管释放液体，通常是反应的一部分。

练习技巧

为了有效使用这一视频进行 雅思口语练习，建议采取以下练习技巧：

  • 首先，观看视频时，尽量跟随发言者的语速和语调，进行 shadow speak 操练。尤其注意讲解中对病毒和免疫系统的描述，尝试复述一遍。
  • 将视频暂停，在关键句子后进行模仿，特别是医学相关的术语，帮助提高你对这些词汇的发音和理解。
  • 重复听两到三遍，尽量让自己的语音语调接近视频中的发音。这有助于提高英语发音能力。
  • 试着将视频中的内容以简短的段落进行总结，这不仅帮助理解，更能促进口头表达能力的提升。
  • 最后，分享你对视频内容的看法，或是向朋友解释免疫系统如何工作，这种形式的口语练习能够有效提高你在实际交流中的流利度。

什么是跟读法？

跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。