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考拉是怎么保持凉爽的?

How Do Koalas Stay Cool?

[Intro]
[Intro]
大家好,我是Jessi,这是儿童科学秀。这里有点儿热啊
Hello, I’m Jessi and this is SciShow Kids. It’s kind of warm in here.
除非你变成一只机器鼠,不然有时你可能会觉得很热
Unless you happen to be a robotic rat, you probably get hot from time to time.
我们人类和许多其他动物同样如此,而且不同的动物有不同的诀窍
Us humans and lots of other animals do, too, and different animals have different tricks
保持凉爽
for keeping cool.
在夏天,例如,我喜欢踢足球。比赛结束时
In the summer, for example, I like to play soccer. And by the end of the game, after
在跑跑跳跳之后,我的头发和脸上都满是汗水
all that kicking and running around, my hair and my face are wet with sweat.
朋友们,汗水是你的身体产生的最好的东西
Sweat, my friends, is one of the best things your body will ever do!
当我们发热时我们的皮肤就会产生汗水,随着汗水干了,我们就会觉得凉爽
Our skin makes sweat when we get hot, because as the sweat dries, it cools us down.
但是问题是:并不是所有动物的汗水都像我们一样
But the thing is: not all animals can sweat like we do.
例如,狗,汗水只能来自他们身体没有被毛发覆盖的那一部分
Dogs, for example, can only sweat through the parts of their bodies that aren’t covered
像他们走路时的爪子
in fur, like the pads of their paws.
所以为了保持凉爽,他们通常舔他们的鼻子,当狗经历了大量短促的呼吸后
So to keep cool, they lick their noses, and they pant — that’s when dogs take a lot
他们会伸出舌头来喘气
of short, quick breaths, with their tongues sticking out.
随着他们舌头和鼻子上的水分干了后,就会变得凉爽——很像
As the moisture on their tongues and noses dries, it cools them down — a lot like when
当你汗水干了的时候
your sweat dries.
但是你知道谁会在保持凉爽上有更大的问题吗
But you know who has an even BIGGER problem keeping cool?
考拉
Koalas.
考拉栖息于澳大利亚,这里特别是在夏天会变得非常炎热和干燥
Koalas live in Australia, where it can get really hot and dry, especially in the summer.
但是考拉不能排汗
But koalas can’t sweat!
而且当它觉得很热的时候,他们不喜欢舔他们自己,因为这样做会
AND when it gets really hot they don’t like to lick themselves, because doing that can
消耗他们身体内许多水分
use up a lot of water in their bodies.
当你生活在一个炎热,干燥的地方,是很难得到水的
And when you live in a hot, dry place, water can be really hard to come by.
那就是为什么考拉通常不喝很多水的原因。相反,他们通常
And that’s why koalas don’t normally drink very much — instead, they usually get the
从他们吃的叶子上获取所需的水分
water they need from the leaves they eat.
但是,如果考拉不能排汗,而且他们也不喜欢舔自己或者像狗一样的喘气
But, if koalas can’t sweat, and they don’t like to lick themselves, or pant like a dog,
那么一只感到炎热的考拉会怎么做呢
then what’s a hot koala to do?
就在最近,科学家们发现考拉是如何保持凉爽的
Well, just recently, scientists have figured out how koalas keep cool.
他们紧抱大树
They hug trees!
你一定听过吧
You heard me right!
在很长一段时间内,科学家们都观察到考拉花很多时间
For a long time, scientists have noticed that koalas spend a lot of their time with their
环抱着树干或者大树的分枝
arms wrapped around the trunk or branch of a tree.
似乎这并不太让人惊讶,因为考拉几乎所有时间都在
That might not seem so surprising, because koalas spend almost all of their time in the
树上
trees.
但是这儿有很多其他的动物,像一些猴子也住在树上。但是
But there are plenty of other animals, like some monkeys, that live in trees, too. But
他们并没有感觉需要一直抱着树木
they don’t feel the need to hug trees all the time.
科学家们的发现表明,即使天气炎热,树木通常
What scientists discovered is that, even when the weather’s hot, the trees are usually
比周围的空气更加凉快
a lot cooler than the air around them.
所以,尽可能的用身体靠着大树,考拉自己会感到凉爽
So, by spreading as much of their bodies against the tree as possible, koalas can cool themselves
而不会通过舔他们自己或者喘气丢失水分
down — without losing water by licking themselves, or panting.
聪明的考拉!非常感谢参与这一期的儿童科学秀;随后这周可以查阅更多
Clever koalas! Thanks for joining me at SciShow Kids; check back later in the week for more
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videos about animals and all things science!

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