تدريب Shadowing: Everything You Didn't Know About Fluorescent Animals - تعلم التحدث بالإنجليزية مع YouTube

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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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عن هذه الدرسة

في هذا الدرس، سوف نتعلم عن خصائص الحيوانات الفلورية وكيفية استجابة بعض الهياكل للعوامل الخارجية مثل الضوء فوق البنفسجي. سيتم التركيز على نطق الكلمات والعبارات الجديدة المرتبطة بهذا الموضوع. ستساعدكم هذه المعلومات على تحسين مهاراتكم في اللغة الإنجليزية، خصوصًا في سياقات المحادثة والمناقشات العلمية. سنتحدث أيضًا عن بعض النصائح لتمرين طريقة التظليل في الإنجليزية لتعزيز فهمكم لنطق اللغة الإنجليزية.

المفردات والعبارات الأساسية

  • الهيكل العظمي - Skeleton
  • الضوء فوق البنفسجي - Ultraviolet light
  • الحيوانات الفلورية - Fluorescent animals
  • امتصاص الضوء - Absorbing light
  • الإشعاع - Emission
  • الوزن الموجي - Wavelength
  • الجمجمة - Skull
  • السرطان - Scorpion

نصائح للممارسة

لتحسين مهاراتك في التحدث، يمكنك تطبيق طريقة التظليل في الإنجليزية عند مشاهدة هذا الفيديو. قم بتشغيل الفيديو واستمع جيدًا لنبرة المتحدث وسرعته. حاول تكرار الكلمات والعبارات مثله تمامًا، مع مراعاة الإيقاع والتنغيم. يمكنك استخدام خاصية الإعادة في الفيديو للاستماع إلى الجمل عدة مرات. هذه التقنية توفر لك فرصة لتحسين مهارات الاستماع والنطق في الوقت نفسه. يمكنك زيارة shadowing site للحصول على المزيد من الموارد المفيدة لهذه الطريقة، ولننسى أهمية استخدام تعلم الإنجليزية مع يوتيوب لكسب المزيد من المعرفة والممارسة. تذكر أن الاستمرار في التدريب بشكل منتظم سيؤدي إلى تحقيق نتائج ملحوظة في مهاراتك اللغوية.

ما هي تقنية التظليل الصوتي؟

التظليل الصوتي (Shadowing) تقنية تعلم لغة مدعومة علمياً، طُورت أصلاً لتدريب المترجمين الفوريين المحترفين. الطريقة بسيطة لكنها قوية: تستمع لصوت إنجليزي أصلي وتكرره فوراً بصوت عالٍ — كظل يتبع المتحدث بتأخير 1-2 ثانية. تُظهر الأبحاث تحسناً كبيراً في دقة النطق والتنغيم والإيقاع وربط الأصوات والاستماع والطلاقة.

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