为什么你的身体如此神奇！：英语精读讲义

Your body is made up of many atoms, 短語動詞

你的身体由大量原子组成，

around 7 octillion to be exact. 短語搭配

准确来说，大约有7×10²⁷个。

These make up the 37 trillion cells in your body, 短語動詞

这些原子构成了你体内的37万亿个细胞，

which are actually much younger than you think. 語法

而这些细胞其实比你想象中年轻得多。

The cells that line your stomach regenerate every 5 days, 用詞

胃内壁的细胞每5天就会再生一次，

which makes sense as stomach acid can dissolve metal. 短語搭配

这也很合理，毕竟胃酸连金属都能溶解。

Your skin's outer layer,

皮肤的最外层，

known as the epidermis, 語法

也就是表皮，

is shed every 2 to 4 weeks,

每2至4周就会脱落一次，

meaning after 1 year you'll shed roughly 0.7 kg of dead skin, 表達脈絡

也就是说，一年后你大约会脱落0.7公斤的死皮，

and only some cells have been with you your entire life.

而只有少数细胞从出生起就一直陪伴着你。

Those of the inner lens of the eye,

比如眼睛晶状体内部的细胞，

and muscle cells of the heart,

心脏的肌肉细胞，

and the neurons of the cerebral cortex in your brain,

以及大脑皮层中的神经元，

which is largely responsible for your memory. 短語搭配

而大脑皮层主要负责你的记忆。

And while the brain may seem small, 語法

虽然大脑看起来不大，

all those wrinkles are for a good reason.

但那些褶皱的存在大有道理。

Spread it all out and the brain would be about the size of a pillowcase, 講解

如果把它完全展开，大脑大约会有一个枕套那么大，

which is great for the trillion nerves powering your memory.

正好能容纳那一万亿条支撑记忆运作的神经。

In fact,

事实上，

studies have shown that after viewing 2,500 images for only 3 seconds, 講解

研究显示，在看过2500张图片、每张只看3秒后，

participants could recall if they had seen one of the images with 92% accuracy. 語法

参与者能以92%的准确率判断自己是否看过其中某张图片。

Don't believe your eyes? 表達脈絡

不相信自己的眼睛？

Maybe it's because you spend 10% of the day blinking, 語法

也许是因为你一天中有10%的时间都在眨眼，

but they can actually distinguish between 2.3 to 7.5 million colors.

但实际上，眼睛能分辨230万至750万种颜色。

Your nose is able to discriminate between 1 trillion different smells. 用詞

你的鼻子则能辨别一万亿种不同的气味。

Meanwhile,

与此同时，

your fingers can feel a ridge as small as 13 nm in size.

你的手指甚至能感受到尺寸仅13纳米的细微凸起。

That's 7,500 times smaller than the diameter of a human hair. 語法

这比人类头发的直径还要小7500倍。

And while you may not think much of your pinky finger, 習語

虽然你可能不太在意自己的小指，

without it you'd lose 50% of your hand's strength. 語法

但少了它，你的手部力量会损失50%。

Sure, 表達脈絡

当然，

the index and middle finger are essential to help pinch and grab with the thumb,

食指和中指对于配合拇指捏取和抓握至关重要，

but it's your ring and pinky finger that give your hand power.

但真正赋予手掌力量的，是无名指和小指。

Now,

现在，

clasp one hand into the other.

用一只手握住另一只手。

That's roughly the size of your heart.

这大致就是你心脏的大小。

It beats 100,000 times per day,

它每天跳动10万次，

pumping 5.5 L with each pulse, 語法

每次搏动泵出5.5升血液，

which is close to 3 million L of blood every year.

相当于每年泵出近300万升血液。

If you live to 75, 短語搭配

如果你活到75岁，

it would fill 90 Olympic-sized swimming pools.

这些血液足以装满90个奥运会标准泳池。

When it's all said and done, 習語

到最后，

human decomposition begins around 4 minutes after death.

人死后大约4分钟，身体就会开始分解。

This process is known as self-digestion,

这个过程叫作“自体消化”，

in which your enzymes and bacteria eat you away. 講解

也就是体内的酶和细菌逐渐把你分解掉。

In fact,

事实上，

3 to 5 lb of your body is made up of bacteria.

你体内的细菌总重达3至5磅。

In an unclean mouth alone,

单是在卫生状况不佳的口腔中，

100 million to 1 billion bacteria can grow on each tooth.

每颗牙齿上就可能滋生1亿至10亿个细菌。

With 32 teeth each,

按每个人有32颗牙齿来算，

some of us have more bacteria in our mouth than there are people in the world. 語法

有些人口中的细菌甚至比全世界的人口还多。

And if that leaves you weak in the knees, 習語

如果这让你双腿发软，

don't worry.

别担心。

Your bones are incredibly strong.

你的骨骼坚固得惊人。

When testing compression strength for a rate of 1 second,

在进行持续1秒的抗压强度测试时，

an 83 kg person with US shoe size 11 could have 16,000 people stand on their bone at once. 語法

一个体重83公斤、穿美码11号鞋的人，其骨头可同时承受16000人站在上面。

That is, of course,

当然，

if there was enough room.

前提是有足够的空间。

And from the bones of our ancestors,

而从祖先的骨骼中，

we can extract DNA to learn about them.

我们可以提取DNA，进一步了解他们。

But if we were to take all of your DNA from your entire body and uncoil it, 語法

但如果把你全身所有的DNA都取出来并完全展开，

it would stretch about 10 billion mi,

总长度会达到约100亿英里，

which is from here to Pluto and back. 短語搭配

相当于从这里到冥王星再返回的距离。

And if you took all of your veins,

而如果你把全身所有的静脉、

capillaries, and arteries and laid them end-to-end, 短語搭配

毛细血管和动脉首尾相接地铺开，

you'd die.

你会死。

So, don't do that.

所以，千万别这么做。

Got a burning question you want answered? 講解

有没有什么问题让你迫不及待想知道答案？

Ask it in the comments or on Facebook and Twitter.

欢迎在评论区，或在Facebook和Twitter上提问。

And if you want the inside scoop on upcoming episode ideas and behind the scenes, 習語

如果你想抢先了解后续节目的创意构思和幕后花絮，

check out our personal Instagram and Twitter handles. 講解

就去看看我们的个人Instagram和Twitter账号。

And subscribe for more weekly science videos.

记得订阅，每周观看更多科学视频。