跟读练习: How far would you have to go to escape gravity? - Rene Laufer - 通过YouTube学习英语口语
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More than six thousand light years from the surface of the earth, a rapidly spinning neutron star called the Black Widow pulsar blasts its companion brown dwarf star with radiation as the two orbit each other every 9 hours.
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More than six thousand light years from the surface of the earth, a rapidly spinning neutron star called the Black Widow pulsar blasts its companion brown dwarf star with radiation as the two orbit each other every 9 hours.
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Standing on our own planet, you might think you’re just an observer of this violent ballet.
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But in fact, both stars are pulling you towards them.
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And you’re pulling back, connected across trillions of kilometers by gravity.
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Gravity is the attractive force between two objects with mass— any two objects with mass.
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Which means that every object in the universe attracts every other object: every star, black hole, human being, smartphone, and atom are all constantly pulling on each other.
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So why don’t we feel pulled in billions of different directions?
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Two reasons: mass and distance.
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The original equation describing the gravitational force between two objects was written by Isaac Newton in 1687.
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Scientists’ understanding of gravity has evolved since then, but Newton’s Law of Universal Gravitation is still a good approximation in most situations.
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It goes like this: the gravitational force between two objects is equal to the mass of one times the mass of the other, multiplied by a very small number called the gravitational constant, and divided by the distance between them, squared.
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If you doubled the mass of one of the objects, the force between them would double, too.
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If the distance between them doubled, the force would be one-fourth as strong.
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The gravitational force between you and the Earth pulls you towards its center, a force you experience as your weight.
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Let’s say this force is about 800 Newtons when you’re standing at sea level.
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If you traveled to the Dead Sea, the force would increase by a tiny fraction of a percent.
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And if you climbed to the top of Mount Everest, the force would decrease— but again, by a minuscule amount.
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Traveling higher would make a bigger dent in gravity’s influence, but you won’t escape it.
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Gravity is generated by variations in the curvature of spacetime— the three dimensions of space plus time— which bend around any object that has mass.
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Gravity from Earth reaches the International Space Station, 400 kilometers above the earth, with almost its original intensity.
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If the space station was stationary on top of a giant column, you’d still experience ninety percent of the gravitational force there that you do on the ground.
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Astronauts just experience weightlessness because the space station is constantly falling towards earth.
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Fortunately, it’s orbiting the planet fast enough that it never hits the ground.
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By the time you made it to the surface of the moon, around 400,000 kilometers away, Earth’s gravitational pull would be less than 0.03 percent of what you feel on earth.
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The only gravity you’d be aware of would be the moon’s, which is about one sixth as strong as the earth’s.
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Travel farther still and Earth’s gravitational pull on you will continue to decrease, but never drop to zero.
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Even safely tethered to the Earth, we’re subject to the faint tug of distant celestial bodies and nearby earthly ones.
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The Sun exerts a force of about half a Newton on you.
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If you’re a few meters away from a smartphone, you'll experience a mutual force of a few piconewtons.
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That’s about the same as the gravitational pull between you and the Andromeda Galaxy, which is 2.5 million light years away but about a trillion times as massive as the sun.
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But when it comes to escaping gravity, there’s a loophole.
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If all the mass around us is pulling on us all the time, how would Earth’s gravity change if you tunneled deep below the surface, assuming you could do so without being cooked or crushed?
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If you hollowed out the center of a perfectly spherical Earth— which it isn’t, but let’s just say it were— you’d experience an identical pull from all sides.
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And you’d be suspended, weightless, only encountering the tiny pulls from other celestial bodies.
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So you could escape the Earth’s gravity in such a thought experiment— but only by heading straight into it.
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为什么通过这个视频练习口语？
本视频讲解了引力的基本概念，结合复杂的天文学原理，用通俗易懂的方式呈现。通过与视频中的解说进行互动，学习者可以增强英语口语表达能力，理解科学术语及其在日常对话中的运用。这种形式的学习也能有效提升语言的流畅度，使学生在与他人交流时更加自信。利用这种英语口语练习的方法，学习者能够在沟通中更轻松地运用科学相关的词汇和短语。
语法与表达在上下文中的应用
- 引力的定义：视频提到“引力是任何两个有质量的物体之间的吸引力”，这里强调了“任何两个”，说明引力的普遍性。
- 因果关系：说到“如果你将一个物体的质量翻倍，引力也会翻倍”，这体现了逻辑思维的结构，学习者可以在口语中使用类似的表达来说明因果关系。
- 相对性：提到“如果距离加倍，引力会减弱四分之一”，这让我们看到如何通过比较强调不同变量的影响，可以帮助学习者理解并使用比较结构。
- 情态动词的运用：短语“你会经历重量”，以及“你可以假设”，展示了情态动词的使用，适合用于表达可能性或假设情形。
常见的发音陷阱
在观看视频时，学习者可能会遇到一些发音挑战。比如，“gravitational”这个词的发音较为复杂，多音节的结构需要练习。另一个需要注意的单词是“neutron”，注意“n”与“tr”结合的部分，容易造成发音上的误差。此外，“mass”和“distance”这两个词在句子中的重音位置不同，注意掌握。通过英语影子跟读的练习，学习者可以纠正这些发音，提升整体口语表达的清晰度。
因此，利用本视频进行英语口语练习和shadow speech的活动，是提高语言能力的一个有效方法。通过英语影子跟读，学习者可以增强语音的流畅度和口音的准确性，为与他人交流打下良好的基础。
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。