跟读练习: Everything You Didn't Know About Fluorescent Animals - 通过YouTube学习英语口语
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Inside this box is...
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Inside this box is...
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The skull of a rat.
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If I place this rat skull underneath a UV blacklight, nothing will happen.
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But I have another skull, and something different will happen with this one.
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This is a squirrel skull.
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And if I place this skull under a UV black light, something very unusual happens.
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Ultraviolet light hits the squirrel skull and is absorbed by special compounds called porphyrins.
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After absorbing the UV light, the porphyrins gain a ton of energy, which they release as a different kind of light.
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Notice how the released light has a longer wavelength than the UV light.
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That means instead of being invisible UV light, it's visible light.
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That's pink.
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Here's what the rat skull looks like.
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This is what most bones look like under a a UV light.
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But here's what a squirrel skull looks like.
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It's pink.
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When things do this, we say they're fluorescent.
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Squirrels are fluorescent pink under UV lights.
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Well, just their insides, actually.
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But there are many other fluorescent animals that glow on the outside.
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To find our next fluorescent animal will take a trip to the desert.
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Ah, what a nice view.
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What was that?
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Over there.
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A scorpion.
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Now, if we place a scorpion under a UV blacklight, Just like the squirrel, something unusual happens.
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Ultraviolet light hits the scorpion's exoskeleton, is absorbed, then released back into the world at a different wavelength that we can see.
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This is just like the squirrel skulls, but there's one big difference.
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Notice how the light released by the scorpion has a shorter wavelength than the light released by the squirrel.
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Well that means instead of glowing pink like a squirrel skull the scorpion will glow a different color.
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It's green.
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There aren't any scorpions that live around me but I bet we can still find some fluorescent animals outside using this.
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This is a special flashlight.
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Take a look at the top.
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You see those bulbs?
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Those are a bunch of UV light bulbs.
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This is a UV flashlight.
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So let's go outside and search for some fluorescent animals.
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It's nighttime.
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Let's search in this forest.
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You never know what you'll find out here at night.
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So I found a few very fluorescent animals.
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We'll start with this one.
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This is a caterpillar.
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But what kind?
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Notice the white slashes on the caterpillar's side.
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They kind of go right up to the caterpillar's spiracles, those holes that they breathe out of.
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Then, look here on the end.
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There's a long extension on the caterpillar's backside Like a horn, almost If you come across a caterpillar with white slashes And a long horn on its rear end It's likely
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A tobacco hornworm caterpillar These can eat up your tomato plants throughout the summer But this was the star of the walk.
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No other plant glowed like this in the entire forest.
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So what plant is it?
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Alright, I got it.
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So notice how the leaf is shaped like a heart.
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All of the veins start at one point, and the surface of the leaf is kind of shiny and waxy.
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This is a vine called Smilax.
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But there's something strange about this fluorescence.
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Can you tell what it is?
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Squirrel skulls, scorpions, hornworms, they fluoresce everywhere.
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But Smilax only fluoresces in some places.
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Let's take a closer look.
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Do you notice how the most fluorescent parts of the leaf are the veins?
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Smilax doesn't have fluorescent compounds all over its entire surface, like a scorpion.
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Instead, its fluorescent compounds are concentrated in its veins.
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And that's why it looks like a Jackson Pollock painting.
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All of these organisms are naturally fluorescent.
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But scientists have created fluorescent animals too.
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To find out how, we'll take a trip into the ocean.
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This is a crystal jellyfish.
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Inside these jellyfish are a bunch of special proteins that fluoresce.
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of like porphyrins on squirrels.
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So under a UV light, crystal jellyfish naturally glow green.
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In the 1990s, scientists looked at the crystal jelly's DNA and found the specific sequence that made those special glowing proteins.
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Then they cut it out and added it into the DNA of...
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a zebrafish.
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Normal zebrafish look like this under a UV light.
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But the new fish that they created with a tiny bit of jellyfish DNA looked like this.
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It glowed green.
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The scientists had created a brand new fluorescent green fish.
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Naturally, they were very excited, so they did the same thing with fluorescent coral and sea anemones.
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They sliced out pieces of of their DNA and put them into fish.
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So the fish fluoresced too.
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And that's how they created fluorescent fish that look like this.
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本课概述
在这节课中，学习者将通过观看有关荧光动物的视频，练习英语口语和听力。视频以有趣的方式介绍了荧光动物的特性，帮助学习者理解科学术语，并在说话中应用这些知识。通过分析视频内容，学习者能够提高他们的发音和口语流利度，特别是在科学话题方面。
关键词汇与短语
- 荧光 (Fluorescent)
- 紫外线 (Ultraviolet light)
- 骨骼 (Skull)
- 外骨骼 (Exoskeleton)
- 波长 (Wavelength)
- 释放 (Release)
- 能量 (Energy)
- 可见光 (Visible light)
练习技巧
为了充分利用视频内容并提升你的英语口语能力，请尝试使用影子跟读技巧。视频中的语速较快，但你可以通过重复跟读来掌握节奏。首先，聆听每段话，确保你理解所表达的意思，然后尝试跟随说话者的语音和语调。如果你感觉内容太快，可以先暂停视频，反复播放较难的部分。当你准备好后，尝试大声朗读并模仿视频中的发音。通过这种方式，你将有助于提高你的英语发音和整体口语流利度。建议在观看视频的同时使用英语影子跟读网站，帮助你进行更加高效的练习。
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。