跟读练习: How brain parasites change their host's behavior - Jaap de Roode - 通过YouTube学习英语口语
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Which of these entities has evolved the ability to manipulate an animal many times its size?
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Which of these entities has evolved the ability to manipulate an animal many times its size?
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The answer is all of them.
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These are all parasites, organisms that live on or inside another host organism, which they harm and sometimes even kill.
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Parasite survival depends on transmitting from one host to the next, sometimes through an intermediate species.
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Our parasites elegantly achieve this by manipulating their host's behavior, sometimes through direct brain hijacking.
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For example, this is the Gordian worm.
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One of its hosts, this cricket.
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The Gordian worm needs water to mate, but the cricket prefers dry land.
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So once it's big enough to reproduce, the worm produces proteins that garble the cricket's navigational system.
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The confused cricket jumps around erratically, moves closer to water, and eventually leaps in, often drowning in the process.
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The worm then wriggles out to mate and its eggs get eaten by little water insects that mature, colonize land, and are, in turn, eaten by new crickets.
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And thus, the Gordian worm lives on.
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And here's the rabies virus, another mind-altering parasite.
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This virus infects mammals, often dogs, and travels up the animal's nerves to its brain where it causes inflammation that eventually kills the host.
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But before it does, it often increases its host's aggressiveness and ramps up the production of rabies-transmitting saliva, while making it hard to swallow.
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These factors make the host more likely to bite another animal and more likely to pass the virus on when it does.
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And now, meet Ophiocordyceps, also known as the zombie fungus.
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Its host of choice is tropical ants that normally live in treetops.
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After Ophiocordyceps spores pierce the ant's exoskeleton, they set off convulsions that make the ant fall from the tree.
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The fungus changes the ant's behavior, compelling it to wander mindlessly until it stumbles onto a plant leaf with the perfect fungal breeding conditions, which it latches onto.
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The ant then dies, and the fungus parasitizes its body to build a tall, thin stalk from its neck.
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Within several weeks, the stalk shoots off spores, which turn more ants into six-legged leaf-seeking zombies.
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One of humanity's most deadly assailants is a behavior-altering parasite, though if it's any consolation, it's not our brains that are being hijacked.
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I'm talking about Plasmodium, which causes malaria.
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This parasite needs mosquitoes to shuttle it between hosts, so it makes them bite more frequently and for longer.
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There's also evidence that humans infected with malaria are more attractive to mosquitoes, which will bite them and transfer the parasite further.
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This multi-species system is so effective, that there are hundreds of millions of malaria cases every year.
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And finally, there are cats.
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Don't worry, there probably aren't any cats living in your body and controlling your thoughts.
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I mean, probably.
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But there is a microorganism called Toxoplasma that needs both cats and rodents to complete its life cycle.
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When a rat gets infected by eating cat feces, the parasite changes chemical levels in the rat's brain, making it less cautious around the hungry felines, maybe even attracted to them.
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This makes them easy prey, so these infected rodents get eaten and pass the parasite on.
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Mind control successful.
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There's even evidence that the parasite affects human behavior.
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In most cases, we don't completely understand how these parasites manage their feats of behavior modification.
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But from what we do know, we can tell that they have a pretty diverse toolbox.
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Gordian worms seem to affect crickets' brains directly.
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The malaria parasite, on the other hand, blocks an enzyme that helps the mosquitoes feed, forcing them to bite over and over and over again.
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The rabies virus may cause that snarling, slobbering behavior by putting the immune system into overdrive.
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But whatever the method, when you think about how effectively these parasites control the behavior of their hosts, you may wonder how much of human behavior is actually parasites doing the talking.
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Since more than half of the species on Earth are parasites, it could be more than we think.
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为什么要通过这个视频练习口语？
在这个视频中，您将了解到寄生虫如何操控宿主的行为。这不仅富有启发性，还能激发您的兴趣，进而促进学习。观看这样有趣的内容可以提高您在真实环境中的英语会话能力。通过模仿视频中的演讲者，您可以练习您的语调和流利度，这有助于提高您在雅思口语练习中的表现。此外，与内容相关的主题可以帮助您扩展词汇量，使您的英语交流更加丰富。因此，看YouTube学英语不仅是一种学习方法，更是一种提升思维与表达的方式。
语法与表达的上下文
这段视频中有几种语法结构和表达方式值得我们注意：
- Which of these entities has evolved the ability to manipulate... - 这一问句结构可以帮助说明选择或比较，在讨论中显得更为严谨。
- Parasite survival depends on transmitting from one host to the next... - 这个句子展示了因果关系的表达，有助于增强您在叙述中表达逻辑的能力。
- the worm produces proteins that garble the cricket's navigational system... - 使用定语从句能够让您在说话中更加准确地描述事物，增加表达的复杂性。
通过对这些结构的练习，您可以在雅思口语练习中更加自信地表达思想。
常见发音陷阱
在这个视频中，有几个发音可能对学习者造成挑战：
- Gordian worm - 此短语的发音需要注意重音的放置，以确保清晰表达。
- manipulate - 这个词的音节较多，强调第二音节可能会帮助您更流利地发音。
- Ophiocordyceps - 作为一个科学名称，通常会让人感到棘手，所以建议反复练习以掌握其准确发音。
通过shadow speech和相关的发音训练，您可以在说话时更加自然流畅，显著提高英语发音。
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。