跟读练习: Why do snakes shed their skin? - 通过视频学习英语口语

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(phone ringing) - Hi, it's Doug.

This is my family's pet tortoise, Mr. Tortoise.

I know, not the most creative name in the world.

Like other tortoises and turtles, as Mr. Tortoise grows, he sometimes sheds little bits of skin, even layers of these little plates on his back.

Someone named Molly, has a question about another kind of reptile that does this.

Let's give Molly a call now.

(phone ringing) - Hi, Doug. - Hi, Molly.

- I have a question for you, why does snakes shed their skin?

- Ooh, that's a great question.

Walking around in a forest, you might even find something like this, an entire skin left behind by a snake after it shed.

It's not common to see a wild snake in the act of shedding its skin, but people who have pet snakes have filmed lots of videos of this.

Like, check this out.

This is a type of snake called a Milk snake.

This one is named Candy Cane and Candy Cane here is in the process of shedding his skin with a little help from his caretaker.

Shedding starts at the snake's head and can take hours or days for the snake's old skin to be fully left behind.

And it's not just snakes that do this.

Insects do too, like dragonflies for example.

You can sometimes find the shed skins left behind by them, sitting on the tops of tall grass, or in many parts of North America, you can find the shed skin left behind by this, a cicada.

Wow, look at that.

Spiders do this too, like this tarantula.

Even some ocean creatures do this.

Crustaceans like this crab, as it slowly backs out of its old shell, shedding and leaving it behind.

Whoa, look at that.

Why do all of these animals do this?

Well, one clue is how often they do it.

All of these animals shed their skin a lot more when they're young, when they're growing.

Some baby snakes will shed their skin every two weeks.

Gradually, as they get bigger and bigger, they do it less often.

Instead of every two weeks, it becomes more like two to four times per year.

So shedding their skin seems to have something to do with how they grow, but wait a second, because we grow too and we don't shed our skins like a snake or an insect.

Can you imagine?

Would our parents save it and show our friends?

Aww, come look at the skin you shed when you were a little baby.

Aww, it's so cute.

Oh, that would be so weird.

And it's not just us either, lots of other animals don't seem to shed their skin as they grow, dogs, cats, hamsters, why do animals like snakes and insects shed their skin, but other living things don't?

What ideas do you have?

Now would be a good time to pause the video and discuss.

Okay, you ready?

Well, actually it turns out we do shed our skin, not our entire skin all at one time, the way a snake or an insect or a crab does, but as our bodies grow, we do grow new skin and we shed little bits of old skin as we're growing.

Usually these little bits of skin we shed are so small, we don't tend to notice them, but sometimes, like if you wear dark clothing, you actually can notice little flecks of it here and there.

It's no big deal, we all do this and when you think about the fact that it means your body's growing, it's actually kind of interesting.

So then, why do these other animals shed their entire skin all at once?

That's something that's hard to know for sure, but it's probably something that's helpful to them.

I asked this question to some scientists who study these animals.

Some of them think that one possibility is that their skin is less flexible than ours.

Animals like insects, spiders, and crabs have a tough outer layer of skin that acts like a shield.

We call it an exoskeleton.

With such tough, rigid skin, it might be that being able to shed the entire skin every few months is what allows these animals to grow.

There could be another reason too.

A lot of animals often have tiny creatures living on them, tiny things like ticks, fleas, lice, sometimes these little animals even carry diseases.

Scientists have pointed out that when snakes shed their skin, it leaves lots of these little pests behind.

Shedding their skin gets rid of these pests.

So maybe shedding their entire skin all at once is a special feature that some animals have to get rid of pests.

Now, that said, animals that don't shed their entire skin can still get ticks and lice on them so they have to rely on other ways to get rid of these.

Like these giraffes who rely on birds to help pick them clean of any little pests, or these snow monkeys in Japan, they're carefully grooming each other to remove any tiny pests that might be hanging out in their fur.

So in summary, lots of animals shed their skin to make room as they grow.

Some of them do it all at once, some not.

Shedding their skin all at once has an interesting plus.

You don't have to take a shower.

That's all for this week's question.

Thanks, Molly, for asking it.

Now for the next episode I reached into my question jar and picked out three questions sent in to me that I'm thinking about answering next.

When this video is done playing, you'll get to vote on one.

You can choose from, why do we have leap years?

Who invented the piano?

Or how do traffic lights work?

So submit your vote when the video is over.

I wanna hear from all of you watching.

There are mysteries all around us.

Stay curious and see you next week.

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为什么要通过这个视频练习口语？

通过这个视频，学习者可以在生动和真实的语境中练习英语口语。视频中关于蛇换皮的讨论，不仅提供了有趣的科学知识，还让学员与日常生活中的话题紧密相连，帮助他们在雅思口语练习中更加自信。利用这样的材料，学习者能够领会如何自然地表达自己的疑问和观点，提升英语口语能力。

语法和表达的语境分析

在视频中，演讲者使用了几种关键的语法结构，以下是一些示例：

“为什么…？” - 这个结构用于引入问题，非常适合在日常交流中使用。
“有时候…” - 这种表达方式能够帮助学习者引入时间概念，提升叙述能力。
“当…时” - 用于描述条件和事件之间的关系，非常实用。
“也许…” - 这是一种表达不确定性的方式，适合用在推测或者讨论时。

运用这些结构，学习者能够更灵活地进行英语口语练习，增加表达的多样性和流利度。

常见的发音难点

在视频中，有些单词的发音可能会对学习者构成挑战，例如：

“shed” - 确保清晰地发出“sh”音，防止与其他相似单词混淆。
“skin” - 注意元音的清晰发音，避免口音影响理解。
“crustaceans” - 这个复杂的词汇需要多次练习来掌握发音，可以使用“提高英语发音”的方法进行巩固。

掌握这些发音技巧将有助于学习者在实际交流中更加自信。通过不断练习，学习者能够在雅思口语练习中表现得更加自然流畅。

视频中的语法

说话人最常用的结构，并附上视频中的原话：

结构	视频中的用法
现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事	have filmed · have pointed
用 “might / may” 表可能 might/may + 动词 — 有可能但不确定的事	might even find · might be
现在进行时 am/is/are + -ing — 此刻或近期正在发生的事	they're growing · we're growing · I'm thinking
义务：must / have to / need to 表示某事是必要的	have to get · have to rely · have to take

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。

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跟读练习: Why do snakes shed their skin? - 通过视频学习英语口语

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为什么要通过这个视频练习口语？

语法和表达的语境分析

常见的发音难点

视频中的语法

什么是跟读法？