跟读练习: Could we survive prolonged space travel? - Lisa Nip - 通过YouTube学习英语口语
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Prolonged space travel takes a severe toll on the human body.
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Prolonged space travel takes a severe toll on the human body.
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Microgravity impairs muscle and bone growth, and high doses of radiation cause irreversible mutations.
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As we seriously consider the human species becoming space-faring, a big question stands.
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Even if we break free from Earth's orbit and embark on long-duration journeys among the stars, can we adapt to the extreme environments of space?
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This won't be the first time that humans have adapted to harsh environments and evolved superhuman capabilities.
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Not fantastical powers like laser vision or invisibility, but physiological adaptations for survival in tough conditions.
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For example, on the Himalayan mountains where the highest elevation is nine kilometers above sea level, an unacclimated lowland human will experience symptoms of hypoxia, commonly known as mountain sickness.
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At these altitudes, the body usually produces extra red blood cells, thickening the blood and impeding its flow.
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But Himalayans who have lived on these mountains for thousands of years permanently evolved mechanisms to circumvent this process and maintain normal blood flow.
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Cases like that prove that humans can develop permanent lifesaving traits.
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But natural adaptation for entire human populations could take tens of thousands of years.
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Recent scientific advances may help us accelerate human adaptation to single generations.
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To thrive as a species during space travel, we could potentially develop methods to quickly program protective abilities into ourselves.
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A beta version of these methods is gene therapy, which we can currently use to correct genetic diseases.
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Gene editing technology, which is improving rapidly, allows scientists to directly change the human genome to stop undesirable processes or make helpful substances.
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An example of an unwanted process is what happens when our bodies are exposed to ionizing radiation.
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Without an atmospheric barrier and a magnetic field like Earth's, most planets and moons are bombarded with these dangerous subatomic particles.
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They can pass through nearly anything and would cause potentially cancerous DNA damage to space explorers.
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But what if we could turn the tables on radiation?
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Human skin produces a pigment called melanin that protects us from the filtered radiation on Earth.
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Melanin exists in many forms across species, and some melanin-expressing fungi use the pigment to convert radiation into chemical energy.
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Instead of trying to shield the human body, or rapidly repair damage, we could potentially engineer humans to adopt and express these fungal, melanin-based energy-harvesting systems.
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They'd then convert radiation into useful energy while protecting our DNA.
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This sounds pretty sci-fi, but may actually be achievable with current technology.
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But technology isn't the only obstacle.
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There are ongoing debates on the consequences and ethics of such radical alterations to our genetic fabric.
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Besides radiation, variation in gravitational strength is another challenge for space travelers.
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Until we develop artificial gravity in a space ship or on another planet, we should assume that astronauts will spend time living in microgravity.
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On Earth, human bone and muscle custodial cells respond to the stress of gravity's incessant tugging by renewing old cells in processes known as remodeling and regeneration.
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But in a microgravity environment like Mars, human bone and muscle cells won't get these cues, resulting in osteoporosis and muscle atrophy.
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So, how could we provide an artificial signal for cells to counteract bone and muscle loss?
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Again, this is speculative, but biochemically engineered microbes inside our bodies could churn out bone and muscle remodeling signaling factors.
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Or humans could be genetically engineered to produce more of these signals in the absence of gravity.
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Radiation exposure and microgravity are only two of the many challenges we will encounter in the hostile conditions of space.
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But if we're ethically prepared to use them, gene editing and microbial engineering are two flexible tools that could be adapted to many scenarios.
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In the near future, we may decide to further develop and tune these genetic tools for the harsh realities of space living.
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为什么要通过这个视频练习口语？
通过观看这段视频，你可以深入了解人类在太空旅行中所面临的挑战及其潜在的解决方案。这不仅涉及科学知识的获取，还能提升你的口语表达能力。在这样的复杂话题中，模仿视频中的说话者，可以帮助你练习专业术语、科学讨论以及如何在学术环境中进行有效沟通。使用英语影子跟读技巧，能够让你在轻松的氛围中自然提高自己的口语流利度，掌握更复杂的句子结构。因此，利用这种方式实践口语是非常有益的。
语法与表达在上下文中的运用
在这个视频中，演讲者使用了多种重要的语法结构，以下是几个关键示例：
- 被动语态: “人体受到微重力的影响”展示了被动语态的使用，用于强调动作的承受者，而非执行者。
- 条件句: “如果我们能够反过来利用辐射……”这种表达帮助讨论假设情景，对未来的设想充满想象力，有助于语言的灵活运用。
- 名词短语: “基因编辑技术”是当今热门话题，通过理解这种名词组合，学习者可以提升自己在讨论科技等领域时的表达能力。
- 非谓语动词形式: “通过……来维持正常的血流”这一用法展示了如何利用非谓语动词来简化句子结构，从而增强表达的高效性。
常见的发音陷阱
在视频中，有一些发音可能会给学习者带来困扰。例如，"gravity"（重力）和"radiation"（辐射）这两个词对于非母语者来说可能难以准确发音。此外，短语“space travel”（太空旅行）虽然简单，但在快速的语速中容易被误读。建议观众跟随视频，注意演讲者的语调、重音及节奏，通过shadowspeak进行练习，克服这些发音上的挑战。借助看YouTube学英语和shadowspeaks的资源，可以更有效地提高你在这些方面的能力。
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。