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Today is a big day!
今天是个重要的日子！
No, Squeaks, it's not my birthday…
啊，Squeaks，今天不是我生日...
But it is the day that I take the bandage off of my elbow!
但却是我摘掉手肘绷带的日子。
I was riding my bike the other day, and I had a little spill.
有一天，我骑自行车摔了一跤，
Luckily, I wasn't hurt too badly, but I did get a big cut on my elbow.
但幸运的是，没有伤得很重，只是手肘划了一个大口子。
So I cleaned out the cut with warm water and soap, and put on a bandage.
所以我用温水和肥皂清理了伤口，贴上了绷带。
But check it out! It's only a week later, and the cut's basically gone!
快看，仅仅一周，伤口基本不见了。
That's because my body—and yours—has a way to to make cuts and scrapes get all better, or heal.
这是因为你我的身体有一种方法，能让伤口和擦伤变好或愈合。
Even the ones that bleed.
即使流血也能愈合。
Blood travels through your body in what are called blood vessels.
身体的血液通过血管流经身体各处。
They're kind of like straws or tubes.
血管有点儿像吸管或导管。
Most blood vessels are long and flexible, which means they're able to bend.
大多数血管长且灵活，这意味着它们能够弯曲。
There are lots of really tiny blood vessels right under your skin.
你的皮肤底下也有很多的小血管。
They can be thinner than a single hair!
它们可能比一根头发丝还细。
When you get a cut that bleeds,
当你伤口流血时，
you end up with a hole in your skin that's deep enough to break some of those tiny blood vessels
你的皮肤就会留个小洞，深到足以弄坏一些小血管。
It doesn't take long for your body to figure out that something's wrong,
用不了多久，你的身体就会不舒服，
and it starts to do something to stop the bleeding right away!
它会立刻采取措施阻止流血。
Even though blood looks like it's just one liquid, there are actually a few different ingredients in it.
即使血液看起来仅是一种液体，但它却包含几种不同的成分。
Like platelets, which look like little blobs.
如血小板，它们看起来像小斑点。
They're way too small for you eye to see, but there are lots of platelets in your blood,
它们太小了，小到看不见，但你的血液中却有很多。
and they start to fill up the hole your cut made in the blood vessel.
它们开始修复伤口留在血管上的洞。
They act like a plug to stop any more blood from getting out.
它们就像塞子，阻止更多的血液流出。
Your blood also makes a bunch of stringy fibers, which form a kind of a net, or web.
你的血液也会产生一束绳状纤维，它们组成一种网。
The platelets stick to this web, and to each other, making a lump that completely covers the cut.
一个个血小板紧粘着这张网，组成结块完全地覆盖伤口。
After a while, the lump dries out and gets hard.
不久结块就干了，变硬了。
We call this brown, hard lump of platelets and fibers a scab.
我们称这个褐色的，由血小板和纤维构成的结块为痂。
That's true! Squeakes. A scab is a little like a bandage that the body can grow all by itself!
Squeakes,这是真的，痂有点儿像身体自主产生的绷带。
Under the scab, your body is hard at work,
在痂下，你的身体在努力地工作，
killing any germs that might have gotten inside of your body before the platelets plugged up the cut.
杀死所有血小板堵住伤口之前可能进入身体的细菌。
Your body also fixes the holes in the blood vessels so that no more blood can leak out, and it starts to close the cut with new skin.
你的身体还会修复血管的小洞，使它不再流血，并开始用新皮肤来愈合伤口。
As the new skin grows over the cut, the scab starts to get loose.
当新皮肤覆盖伤口后，痂开始脱落。
Once enough of the hole is closed, the scab falls off, and you're as good as new!
一旦小洞完全愈合，痂脱落完，你就完好如初了。
Now, for the tough part.
现在，到了最困难的部分。
Even though it can be hard to do sometimes, leave your scabs alone!
尽管有时很难做到，但还是不要碰你的痂！
Don't pick at them, pull them off, or even scratch them.
别拉它们，撕掉它们，也别挠它们。
Because the scab has an important job: it keeps germs that are outside of your body from getting inside of your body.
因为痂有一个重要的功能：它能阻止体外的细菌侵入到体内。
If germs get inside of your body, they can cause an infection, which can make the cut hurt much worse.
如果细菌侵入体内，可能会导致感染，使伤口恶化。
And if you pull a scab off, you might rip the skin that's growing over the cut,
如果你把痂撕掉，你可能撕的是正在覆盖伤口的皮肤。
and your body would basically have to start all over again.
你的身体基本上要重新开始愈合了。
After stopping the bleeding, making a scab, and growing new skin, it looks like my body's all done fixing the cut I got.
在止血、结痂，长出新皮肤后，我的身体看起来已经做好了所有的伤口愈合工作。
Hey, Squeaks, wanna go for a bike ride?
嗨，Squeaks，想骑车吗？
Thanks for joining us at SciShow Kids!
欢迎收看儿童科学秀！
Do you have a question about your body, or anything else?
如果您对您的身体或是其他事有任何疑问，
Find a grownup and ask them to help you leave a comment below, or send an email to kids@scishow.com!
找个大人帮忙在下方留言，或发邮件至kids@scishow.com!
Thanks, we'll see you next time. You're there for.
很感谢您的收看，等我们。
