為什麼你的身體如此神奇！：英語精讀講義

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

你的身體由大量原子組成，

around 7 octillion to be exact. 片語搭配

準確來說，大約有7×10²⁷個。

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

這些原子構成了你體內的37兆個細胞，

which are actually much younger than you think. 文法

而這些細胞其實比你想像中年輕得多。

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

胃內壁的細胞每5天就會再生一次，

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

這也很合理，畢竟胃酸連金屬都能溶解。

Your skin's outer layer,

皮膚的最外層，

known as the epidermis, 文法

也就是表皮，

is shed every 2 to 4 weeks,

每2到4週就會脫落一次，

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

也就是說，一年後你大約會脫落0.7公斤的死皮，

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

而只有少數細胞從出生起就一直陪伴著你。

Those of the inner lens of the eye,

比如眼睛水晶體內部的細胞，

and muscle cells of the heart,

心臟的肌肉細胞，

and the neurons of the cerebral cortex in your brain,

以及大腦皮質中的神經元，

which is largely responsible for your memory. 片語搭配

而大腦皮質主要負責你的記憶。

And while the brain may seem small, 文法

雖然大腦看起來不大，

all those wrinkles are for a good reason.

但那些皺褶的存在大有道理。

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

如果把它完全展開，大腦大約會有一個枕頭套那麼大，

which is great for the trillion nerves powering your memory.

正好能容納那1兆條支撐記憶運作的神經。

In fact,

事實上，

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

研究顯示，在看過2,500張圖片、每張只看3秒後，

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

參與者能以92%的準確率判斷自己是否看過其中某張圖片。

Don't believe your eyes? 表達脈絡

不相信自己的眼睛嗎？

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

或許是因為你一天有10%的時間都在眨眼，

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

但其實，眼睛能分辨230萬到750萬種顏色。

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

你的鼻子則能辨別1兆種不同的氣味。

Meanwhile,

與此同時，

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僅13奈米的細微凸起。

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

這比人類頭髮的直徑還要小7,500倍。

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

雖然你可能不太在意自己的小指，

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

但少了它，你的手部力量會減少50%。

Sure, 表達脈絡

當然，

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

食指和中指對於配合拇指捏取和抓握至關重要，

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

但真正賦予手掌力量的，是無名指和小指。

Now,

現在，

clasp one hand into the other.

用一隻手握住另一隻手。

That's roughly the size of your heart.

這大致就是你心臟的大小。

It beats 100,000 times per day,

它每天跳動10萬次，

pumping 5.5 L with each pulse, 文法

每次搏動輸送5.5公升血液，

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

相當於每年輸送近300萬公升血液。

If you live to 75, 片語搭配

如果你活到75歲，

it would fill 90 Olympic-sized swimming pools.

這些血液足以裝滿90座奧運標準游泳池。

When it's all said and done, 慣用語

到最後，

human decomposition begins around 4 minutes after death.

人死亡約4分鐘後，身體就會開始分解。

This process is known as self-digestion,

這個過程叫做「自體消化」，

in which your enzymes and bacteria eat you away. 講解

也就是體內的酵素和細菌逐漸把你分解掉。

In fact,

事實上，

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

你體內的細菌總重達3到5磅。

In an unclean mouth alone,

光是在衛生狀況不佳的口腔中，

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

每顆牙齒上就可能滋生1億到10億個細菌。

With 32 teeth each,

以每個人有32顆牙齒來算，

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

有些人口中的細菌甚至比全世界的人口還多。

And if that leaves you weak in the knees, 慣用語

如果這讓你雙膝發軟，

don't worry.

別擔心。

Your bones are incredibly strong.

你的骨骼強韌得驚人。

When testing compression strength for a rate of 1 second,

在進行持續1秒的抗壓強度測試時，

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

一名體重83公斤、穿美規11號鞋的人，其骨頭可以同時承受16,000人站在上面。

That is, of course,

當然，

if there was enough room.

前提是有足夠的空間。

And from the bones of our ancestors,

而從祖先的骨骼中，

we can extract DNA to learn about them.

我們可以提取DNA，進一步了解他們。

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

但如果把你全身所有的DNA都取出來並完全展開，

it would stretch about 10 billion mi,

總長度會達到約100億英里，

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

相當於從這裡到冥王星再回來的距離。

And if you took all of your veins,

而如果你把全身所有的靜脈、

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

微血管和動脈首尾相接地鋪開，

you'd die.

你會死。

So, don't do that.

所以，千萬別這麼做。

Got a burning question you want answered? 講解

有沒有什麼問題讓你迫不及待想知道答案？

Ask it in the comments or on Facebook and Twitter.

歡迎在留言區，或在Facebook和Twitter上提問。

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

如果你想搶先了解後續節目的創意構想和幕後花絮，

check out our personal Instagram and Twitter handles. 講解

就去看看我們的個人Instagram和Twitter帳號。

And subscribe for more weekly science videos.

記得訂閱，每週觀看更多科學影片。