跟读练习: Astronaut Experiment: Crash Course Kids #32.2 - 通过视频学习英语口语
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Seeing is believing, right?
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That's what people say, and that's why some things can be kind of hard to understand.
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Things can look a certain way, but sometimes there's a lot more going on than what your eyes can show you.
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Like last time we learned that all objects, no matter how massive or heavy they are, fall at the same speed on Earth.
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But objects can seem to fall at different speeds because of a little something called air resistance, the friction between a moving object and air.
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So if I drop a hammer and a feather from the same height at the same time, the hammer is going to hit the ground before the feather.
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Now, that's great and all, but do we know that air resistance is what affects how fast things fall here on Earth?
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To figure this out, let's start by going back to our old friend, Commander Dave Scott.
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He is the astronaut who dropped the feather and the hammer on the moon back in 1971.
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And when he dropped them both at the same time, they reached the ground, or at least, the surface of the moon, at the same time, even though the hammer,
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obviously, had a lot more mass than the feather.
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So why did Commander Scott get different results from his experiment,
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whereas if I did, the hammer would hit the ground first? has almost none.
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So as the feather falls through the air on Earth, its flat fluffy shape makes it run into a lot more air resistance than the hammer does.
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In other words, on both Earth and the moon, it's not a difference in gravity that causes the hammer to hit the ground before the feather, it's a difference in air resistance.
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But in order to prove it, we have to do an experiment, like Commander Scott's, but do it on Earth.
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This looks like a job for Cartoon Sabrina.
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For this experiment, she's going to need a ball, a little parachute, and a spacesuit.
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First, let's watch as Mini -Me climbs up a ladder and drops a ball.
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We'll see how long it takes to hit the ground and write down the data.
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Now let's take the same ball and attach a little parachute to it.
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We'll drop it again from the ladder
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and we see it takes longer for the ball with the parachute to hit the ground.
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Why?
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Because there's more friction between the ball -parachute combo and the air than just the ball alone.
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More friction means more air resistance, and more air resistance means a longer time to reach the ground.
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That adds up, right?
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But if we're going to do something like Commander Scott did on the moon, we have to ask: what would happen if there were no atmosphere?
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For this part of the experiment, we'll need to create a vacuum, an area where there is no air.
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So we'll repeat the experiment in a large, airtight room and pump out all of the air, and in you go, Cartoon Sabrina.
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What do you think will happen when Cartoon Me drops the same two things, the ball with the parachute and just the ball, in a room with no air?
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It makes sense that no air means no air resistance, right?
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Let's see.
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First, Cartoon Me drops the ball from the ladder again, and we record the time.
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And then see what happens when we attach the ball to the parachute.
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Well, now the parachute doesn't make much of a difference in how long it takes for the ball to hit the ground.
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In fact, the parachute doesn't even open.
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That's because in a vacuum there is no air.
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No air means no air resistance, and when we take away air resistance, we take away the force that slows down the object that's falling,
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and that means objects dropped from the same height will hit the ground at the same time.
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Scott did on the moon.
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Thanks little me.
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So, air resistance, or the friction between a moving object and the air, has a huge effect on how fast things fall on Earth.
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We can support this argument with the evidence we got from our investigation.
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When it comes to objects falling on Earth, it's the resistance that makes the difference.
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I may not have made it to the moon myself yet, but at least Cartoon Me has managed to recreate a famous astronaut experiment.
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Oh
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背景与上下文
在这个视频中，我们的讲解者通过对比在地球和月球上物体下落的实验，探讨了空气阻力如何影响物体的下落速度。讲解者提到，尽管地球与月球的引力相似，但由于地球有大气，物体在下落时的表现却截然不同。本段对话引导我们理解自然现象背后的科学原理，适合希望通过观察学习来提高英语发音的学生们。
日常交流的五个常用短语
- Seeing is believing - 看见就是相信
- Air resistance - 空气阻力
- Objects fall at the same speed - 物体以相同速度下落
- Different results - 不同的结果
- In a vacuum - 在真空中
逐步跟读指南
为了帮助你更好地理解并实践视频内容，以下是一个逐步跟读的指南，特别适合希望利用shadowing site和看YouTube学英语的学习者：
- 首先，观看视频并确保理解内容，可以适当暂停来消化信息。
- 在视频播放时，找到与上述短语相关的部分，重复讲解者的句子，注意发音和语调。
- 使用文字转录文本，跟读讲解者的每一句话，特别注意提高英语发音的细节。
- 尝试在没有音频辅助的情况下，再次说出相同的句子，检验自己是否能够流利表达。
- 最后，可以选择录音来回听，找出需要改进的地方，促进shadow speak和自我提升。
通过这个过程，你将不仅能理解科学现象，还能在实践中提升你的英语口语能力，结合语言学习与科学探索的乐趣。
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。