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  • A young hospital porter in India is asked by a doctor to go get an oxygen mask, but

    在印度,一個年輕的醫院搬運工被醫生要求去拿氧氣罩,但

  • the porter doesn't quite catch that and instead walks into the room with an entire

    搬運工沒聽懂,而是帶著一整隻手走進房間

  • oxygen tank.

    氧氣罐。

  • This is no ordinary room; it's the domain of the Magnetic Resonance Imaging machine.

    這可不是普通的房間,這是磁共振成像機的領域。

  • That magnet that does the magic in the appliance is not something to be messed with.

    那塊在電器中發揮神奇作用的磁鐵可不是好惹的。

  • It's so powerful that the four-foot tank goes flying across the room at hyper-speed,

    它的威力很大,四英尺的坦克以超高速飛過房間。

  • and unlucky for the porter and a technician, they're in its way.

    而不幸的是,搬運工和一個技術人員,他們在它的路上。

  • Both of them get trapped for hours against the machine, all the time suffering incredible

    他們兩個人都被困在機器上幾個小時,所有的時間遭受不可思議的

  • pain from the force of the tank against them.

    坦克對他們的衝擊力帶來的痛苦。

  • Twenty people pulling on a rope can't get that thing off.

    二十個人拉著一根繩子都不能把那東西弄下來。

  • It's only when someone deactivates the magnetic field that the two seriously injured men are

    只有當有人解除磁場時,兩個重傷的人才會

  • freed.

    釋放了。

  • Ok, so after that very short true horror story you're probably thinking that it's not

    好吧,所以在這個很短的真實恐怖故事之後,你可能會想,這不是。

  • such a good idea to walk about attached to a very powerful magnet.

    這樣一個好主意,走動連接到一個非常強大的磁鐵。

  • Magneto from the X-men you are not, and so messing with magnets for ordinary folks like

    X戰警中的萬磁王你不是,所以給普通人這樣的人搞磁鐵。

  • you is something you might want to give a wide berth.

    你是什麼東西,你可能想給一個廣泛的泊位。

  • But what ifwhat if you somehow could attach a super-powerful magnet to you.

    但是,如果......如果你能以某種方式將一塊超強的磁鐵附在你身上呢。

  • What exactly would happen?

    究竟會發生什麼?

  • Would bicycles start flying through the air and stick to you?

    自行車會不會開始在空中飛舞,粘在你身上?

  • Would metal joints holding people's bones together burst through their flesh and adorn

    將人們的骨頭連接在一起的金屬關節會不會穿透他們的肉體,裝飾在他們的身上?

  • your deadly contraption?

    你的致命裝置?

  • First, you need to know a thing or two about magnets.

    首先,你需要了解一兩件關於磁鐵的事情。

  • You've all played around with harmless versions of them and we expect a few of you have some

    你們都玩過無傷大雅的版本,我們預計你們中的一些人有一些

  • stuck on your fridge right now holding up a message that's two weeks old.

    卡在你的冰箱上,現在舉行了一個資訊 這是兩個星期前。

  • Those things are weak to say the least.

    這些東西說起來很弱。

  • Magnets are measured in Tesla and a fridge magnet only weighs in at 0.001 Tesla.

    磁鐵是以特斯拉為組織、部門的,一塊冰箱磁鐵的重量只有0.001特斯拉。

  • One of those horseshoe magnets they sometimes let you use in school might measure 0.005

    有時在學校裡讓你用的馬蹄形磁鐵可能有0. 005的尺寸

  • Tesla.

    特斯拉

  • Magnetometers are used to measure the strength of a magnet, but we prefer the name pull-tester.

    磁力計是用來測量磁鐵的強度的,但我們更喜歡用拉力測試儀這個名字。

  • You've all likely seen one of those junkyard magnets that can pull cars up.

    你們可能都見過那種垃圾場的磁鐵,可以把車拉起來。

  • They're about one Tesla, which isn't even that strong in the magnet world.

    他們大約是一個特斯拉,在磁鐵世界裡都沒有這麼強。

  • The junkyard magnets are called electromagnets by the way, which means their power depends

    對了,垃圾場的磁鐵叫電磁鐵,也就是說它們的功率取決於

  • on the amount of electricity going through them.

    在通過它們的電量上。

  • You can also turn them off, which comes in handy when you want to put the car down.

    你也可以把它們關掉,這在你想放下車的時候很方便。

  • Permanent magnets on the other hand don't require electricity.

    而永磁體則不需要電。

  • They are what they are, like the ones stuck on your fridge.

    它們是什麼,就像貼在你冰箱上的那些。

  • Ok, so an MRI magnet could be anywhere from 1.5 and 3 Tesla, although the latest breakthrough

    好吧,所以核磁共振成像磁鐵可能是任何地方從1.5和3特斯拉, 雖然最新的突破,

  • MRI magnetic is 12 Tesla.

    核磁共振磁是12特斯拉。

  • Now that's a pretty strong magnet, but it's still not anywhere near the most powerful

    現在,這是一個相當強大的磁鐵, 但它仍然沒有任何地方接近最強大的。

  • magnet.

    磁鐵。

  • The strongest man-made magnet is 45.5 tesla, but even that's not close to the strongest

    最強的人造磁鐵是45.5特斯拉,但即使是最強的磁鐵也差得很遠。

  • magnet out there.

    磁鐵在那裡。

  • Before we get ahead of ourselves let's look at the damage a small magnet could do.

    在說正事之前,我們先來看看一塊小小的磁鐵可能造成的傷害。

  • Well, when we say small, we mean small in comparison to the giants but big in terms

    好吧,當我們說小的時候,我們的意思是小的,與巨頭相比,但大的方面。

  • of stuff you can buy onlineat your own risk.

    的東西,你可以在網上買--風險自擔。

  • Even if the magnet is fairly small, it might be meaty enough to cling very hard to some

    即使是相當小的磁鐵,它也可能是肉質的,可以非常堅硬地附著在一些。

  • metals, of which iron, nickel, and cobalt are a favorite.

    金屬,其中以鐵、鎳、鈷為最愛。

  • So, if you're holding a magnet near some metal object you'd better make sure your

    所以,如果你拿著一塊磁鐵靠近一些金屬物體,你最好確保你的

  • fingers or hand aren't in the way.

    手指或手不礙事。

  • Trust us, we've seen this happen in videos with magnets only about a foot long and a

    相信我們,我們已經看到這種情況發生在視頻中,磁鐵只有大約一英尺長,並且

  • few inches wide and they wield some incredible power.

    幾英寸寬,他們掌握著一些不可思議的力量。

  • If someone's hand was caught between two large magnets, and by large we mean something

    如果有人的手被夾在兩塊大磁鐵之間,我們說的大是指什麼東西

  • you could still hold in your hand, the force could completely destroy your hand.

    你還可以拿在手裡,這股力量可以完全摧毀你的手。

  • There's no way any one human could prize those things apart.

    任何一個人都不可能把這些東西分開來獎。

  • Even so, large magnets you can hold in your hand aren't actually strong enough to make

    即使如此,你能拿在手裡的大磁鐵其實並沒有足夠的強度來使

  • things go flying through the air from a distance.

    東西從遠處的空中飛過。

  • (you can get an idea of size of magnets in this video: https://www.youtube.com/watch?v=p0t0J_ERzHM)

    (你可以在這個視頻中瞭解磁鐵的大小:https://www.youtube.com/watch?v=p0t0J_ERzHM)

  • As for the question, do regular magnets just by themselves cause humans any harm?- it's

    至於問題,普通的磁鐵僅僅是本身就會對人類造成傷害嗎?

  • thought they don't, but the jury is still out on that one.

    以為他們沒有,但陪審團仍然在那一個。

  • Studies that we read say even if the magnetic field is very strong, the effect on the human

    我們讀到的研究報告說,即使磁場很強,對人的影響也是很大的

  • body is negligible.

    體可以忽略不計。

  • That's only half of the story, anyway.

    這只是故事的一半,反正。

  • We'll soon come back to this quite frightening topic.

    我們很快就會回到這個相當可怕的話題上。

  • The strongest permanent magnets we humans make are called neodymium magnets.

    我們人類製造的最強的永磁體叫做釹磁體。

  • Two large ones of these like we described earlier could potentially ruin a perfectly

    像我們之前描述的兩個大的這樣的可能會毀掉一個完美的。

  • good hand if they come together.

    好手,如果他們一起來。

  • Still, even though one of them could quite easily be attached to your head, it's not

    不過,儘管其中一個可以很容易地附在你的頭上,但它並不是。

  • as if metal objects will fly through the air and stick to it.

    彷彿金屬物體會在空中飛舞,粘在上面。

  • You'd just look silly wearing your magnet.

    你戴著你的磁鐵就會顯得很傻。

  • Let's also just add this here before you get any bright ideas: these things should

    在你有任何光明的想法之前,我們也只是在這裡補充一下:這些東西應該是

  • only be handled by people who know what they're doing.

    只有知道自己在做什麼的人才能處理。

  • If you read the warnings about strong but small magnets, you'll see people are told

    如果你讀過關於強而小的磁鐵的警告,你會發現人們被告知

  • to keep them away from things like pacemakers or even mechanical watches.

    讓他們遠離心臟起搏器甚至機械錶等東西。

  • These are not things you should be holding up to your grandpa's chest.

    這些東西你不應該拿在你爺爺的胸前。

  • If a young child somehow managed to swallow two of them, even if they were tiny, they

    如果一個小孩不知怎麼吞下了兩顆,即使它們很小,也會被吞下。

  • could come together in the kid's intestines and cause a big mess.

    可能會在孩子的腸子裡聚集在一起,造成大麻煩。

  • This has actually caused death in the past.

    這在過去其實已經造成了死亡。

  • Keep them away from your nose, too.

    也要讓它們遠離你的鼻子。

  • Early in 2020, an Australian astrophysicist was playing around with four very small magnets

    2020年初,澳洲的一位天體物理學家在玩弄四塊很小的磁鐵。

  • and he ended up in the hospital.

    最後他進了醫院。

  • He said he was bored during the lockdown and so decided to see what would happen if he

    他說,在封鎖期間,他感到很無聊,所以決定看看會發生什麼,如果他

  • attached two small magnets to each nostril.

    在每個鼻孔上貼上兩塊小磁鐵。

  • His intention was to try and create a device that warned people when they touched their

    他的目的是試圖創造一種裝置,當人們觸摸到他們的身體時,會發出警告。

  • faces.

    臉。

  • The inner two locked against the middle of his nose and that was that.

    內側的兩隻鎖住了他的鼻子中間,就這樣。

  • They were too strong for him to pull out and he got his day of fame in the media.

    他們太強勢了,他不能退出,他在媒體上有了成名的一天。

  • He said he even tried to use pliers to pull them out, but the pliers stuck to the magnet,

    他說,他甚至想用鉗子把它們拔出來,但鉗子卡在了磁鐵上。

  • causing him some amount of pain.

    給他造成一定的痛苦。

  • He later said, “Needless to say I am not going to play with the magnets any more.”

    他後來說:"不用說,我是不會再玩磁鐵了。"

  • We think it's now abundantly clear that magnets are not to be messed with, not even

    我們認為現在已經很清楚了,磁鐵是不能亂用的,甚至連

  • the small ones.

    小的。

  • Still, even if you stuck a brick-sized magnet to your head, the magnetic field wouldn't

    不過,即使你把一塊磚頭大小的磁鐵貼在你的頭上,磁場也不會... ...

  • make your toaster become a hat.

    讓你的麵包機變成一頂帽子。

  • To get that kind of power you'd need something like the magnet in an MRI machine, but those

    要想獲得這樣的能量,你需要像核磁共振成像儀中的磁鐵一樣的東西,但這些...

  • are electromagnets.

    是電磁鐵。

  • The MRI magnet is huge and it's powered by electricity so you just couldn't put

    核磁共振成像磁鐵是巨大的,它是由電力驅動的,所以你不能把它放在

  • one on your head.

    一個在你的頭上。

  • Theoretically, if you somehow could, you'd soon be taken out by the first metal objects

    理論上說,如果你有辦法,很快就會被第一個金屬物體幹掉。

  • that entered your magnetic field, and maybe by a flying, shrieking family member.

    進入你的磁場,也許是被一個飛來飛去,尖叫的家庭成員。

  • One thing you could do with a very powerful magnet is levitate above it.

    你可以用一個很強大的磁鐵做一件事,就是懸浮在它上面。

  • Frogs have actually been levitated on a magnet that was 16 Tesla.

    青蛙居然被懸浮在一塊16特斯拉的磁鐵上。

  • The reason for the floating is the water molecules generate a magnetic field opposite to that

    漂浮的原因是水分子產生了與之相反的磁場。

  • of the magnet, since water is what's called a diamagnet..

    的磁鐵,因為水是所謂的二磁鐵。

  • But floating is boring.

    但漂浮是無聊的。

  • Now let's talk about destruction.

    現在讓我們來談談毀滅。

  • This brings us to something out of this world and to what we can call the big league of

    這就給我們帶來了一些出乎意料的東西,我們可以稱之為大聯盟的。

  • magnets.

    磁鐵。

  • So down here on earth our strongest magnet is just above 45 Tesla, which as you know

    所以在地球上,我們最強的磁鐵是在45特斯拉以上,你知道的。

  • in the right circumstances could cause someone to have a very bad day.

    在正確的情況下,可能會導致一個人有一個非常糟糕的一天。

  • But what if we asked you what a billion Tesla could do?

    但如果我們問你10億特斯拉能做什麼?

  • We know we said magnets by themselves had a negligible effect on the human body, but

    我們知道,我們說過磁鐵本身對人體的影響微乎其微,但是... ...

  • we were only talking about small magnetic forces.

    我們說的只是小磁力。

  • It's a totally different picture when you bring in the big guns.

    當你把大兵帶來的時候,情況就完全不同了。

  • Ok, so you probably know what black holes are, but for everyone in the cheap seats,

    好吧,你可能知道什麼是黑洞,但對於大家的便宜座。

  • here's a quick refresher.

    這裡是一個快速的複習。

  • In short, when a large enough star is on its last legs it explodes, and that rather cool

    簡而言之,當一顆足夠大的恆星走到最後一步的時候,它就會爆炸,而那相當酷炫的

  • event is called a supernova.

    事件被稱為超新星。

  • This bright and beautiful thing happens because the star runs out of fuel and it collapses.

    這種光明而美麗的事情發生,是因為恆星沒有燃料了,它崩潰了。

  • That can leave a black hole in its wake.

    那會留下一個黑洞的痕跡。

  • But then you've got some stars of a certain size and when they explode the outer parts

    但是,你已經得到了一些恆星的一定大小,當他們爆炸時,外部的部分。

  • can blast away but a super dense mass is left in the middle.

    可以轟開,但中間會留下一個超密集的團。

  • These are called neutron stars.

    這些被稱為中子星。

  • When we say dense, we mean it.

    當我們說密集的時候,我們是認真的。

  • Just a teaspoon of this stuff would weigh in the region of one billion tons.

    僅僅一茶匙這種東西的重量就在十億噸左右。

  • If that's a bit hard to get your head around, you're not alone.

    如果這有點讓你難以接受,你並不孤單。

  • With gravity on a neutron star being about 2 billion times stronger than it is on Earth,

    中子星上的引力比地球上強20億倍左右。

  • if one should ever wander into our solar system all hell would break loose.

    如果有人闖入我們的太陽系,所有的地獄都會被打破。

  • It would cause cosmic chaos and Earth would hurtle off to another part of the universe.

    這將導致宇宙混亂,地球將匆匆離開到宇宙的另一個地方。

  • There's a type of neutron star called magnetars and as you can probably guess, they pack a

    有一種中子星被稱為磁星,你可能會猜到,它們的體積很大。

  • magnetic punch.

    磁力衝床。

  • Let's just imagine the moon was one of them.

    讓我們想象一下,月亮是其中之一。

  • If that were the case, you wouldn't be using your credit card again since they have magnetic

    如果是這樣的話,你就不會再使用你的信用卡了,因為他們有磁卡。

  • strips in them.

    條在其中。

  • But that would be the least of your worries.

    但這將是你最不擔心的問題。

  • The credit card in fact would be in much better shape than you.

    其實信用卡的狀態會比你好很多。

  • You can thank your lucky stars that no magnetars are close to our home turf, and by that, we

    你可以感謝你的幸運星,沒有磁星靠近我們的地盤,而這,我們

  • mean closer than 200 light-years away.

    是指接近200光年的距離。

  • The thing is, every now and then massive seismic waves of energy erupt on them and they cause

    問題是,每隔一段時間,巨大的地震能量波就會在他們身上爆發,他們會造成。

  • starquakes.

    星震。

  • When this happens, gamma rays spread out.

    當這種情況發生時,伽馬射線就會擴散出去。

  • These have been recorded on our planet in 1979, 1998, and 2004.

    1979年、1998年和2004年在我們的星球上都有記錄。

  • No one was harmed, but the first time it happened the U.S. Department of Defense got a bit of

    沒有人受到傷害,但第一次發生的時候,美國國防部得到了一些

  • shock.

    震驚。

  • The last hit in 2004 destroyed some satellites and made changes to the earth's magnetic

    最後一次撞擊是在2004年,摧毀了一些衛星,並改變了地球的磁場。

  • field.

    領域:

  • Ok, so the electrons in your body are magnetic.

    好吧,所以你身體裡的電子是有磁性的。

  • That's nothing to worry about when we are talking about magnetic fields down here on

    這沒什麼好擔心的,當我們在這裡談論磁場的時候。

  • Earth, but a billion Tesla would literally rearrange a person.

    地球,但十億特斯拉就真的會重新安排一個人。

  • If you were a few hundred miles from that magnetar all the spherical atoms in your body

    如果你離那個磁星幾百英里 你身體裡所有的球狀原子

  • would stretch out and start to look a bit like drinking straws.

    會舒展開來,開始看起來有點像飲管。

  • This wouldn't bode well for you at all.

    這對你來說可不是什麼好兆頭。

  • For a start, your nervous system would no longer function.

    首先,你的神經系統將不再發揮作用。

  • That's because the magnetism from this unpleasant star has messed with all the electrical charges

    那是因為這顆令人不快的恆星所產生的磁力 擾亂了所有的電荷。

  • it takes to keep it running.

    它需要保持它的運行。

  • Atoms and molecules would no longer be working together in harmony.

    原子和分子將不再和諧地共同工作。

  • How this would feel we can't exactly say, but it could be like being ripped apart.

    這會是怎樣的感覺,我們也說不清楚,但可能就像被撕裂了一樣。

  • After all, everything in you would be coming undone.

    畢竟,你身上的一切都會被拆掉。

  • Suffice to say, you'd die very quickly, but you might just have enough time to see

    可以說,你會死得很快,但你可能有足夠的時間去看一看。

  • parts of you twist and elongate, which is about as nightmarish as life could get.

    你的部分扭曲和拉長, 這是關於作為噩夢般的生活可以得到。

  • What's interesting is if this could somehow be observed by someone far enough away sitting

    有趣的是,如果這能被坐在足夠遠的地方的人觀察到。

  • inside a space station, it would look to them like you have stretched out, and then as the

    在空間站內,他們會認為你已經伸展開來了,然後隨著時間的推移

  • star pulled you, you drifted towards it like a long streak of space pee.

    星星拉著你,你像長長的太空尿條一樣向它飄去。

  • The good news is the closest magnetar to us right now is tens of thousands of light-years

    好消息是現在離我們最近的磁星 是幾萬光年的距離

  • away and it's unlikely any will be appearing close to Earth soon.

    離,而且不可能很快出現任何靠近地球的。

  • We'll finish this with something a little different, but it's still a good warning

    我們會用一些不同的東西來結束這一切,但它仍然是一個很好的警告。

  • for all you magnet lovers.

    給各位磁鐵愛好者。

  • For a while now folks over in the UK have been joining in a craze of buying strong magnets

    一段時間以來,英國那邊的人們都加入了購買強力磁鐵的熱潮。

  • and using them to look for hidden stuff in rivers and canals.

    並用它們來尋找河流和運河中隱藏的東西。

  • They just connect the magnet to some rope and then start trawling.

    他們只是把磁鐵連接到一些繩子上,然後開始拖網。

  • That all sounds innocent enough, but not when you hear that some people have pulled out

    這一切聽起來很無辜,但當你聽到有人拿出

  • hand grenades.

    手榴彈。

  • In 2019, a grenade was fished out by a guy and the cops and bomb squad had to close off

    2019年,一個手榴彈被一個人撈了出來,警察和防爆隊不得不關閉了

  • the area for six hours while they dealt with it.

    在他們處理該地區時,該地區有六個小時的時間。

  • What's worrying is that thing could have easily gone off had the man mishandled it.

    令人擔心的是,如果那個人處理不當,那東西很容易就會爆炸。

  • The guy seems to love his hobby, though, once proudly telling the media that he had a collection

    不過這傢伙似乎很喜歡自己的愛好,曾經驕傲地告訴媒體,他有一個收藏品

  • of 13 guns that he'd found in the water.

    的13支槍,他在水中發現。

  • Grenades are often found, but knives are about as common as fish in those murky British waters.

    手榴彈經常被發現,但在那些陰暗的英國海域,刀子就像魚一樣常見。

  • The hobby is fairly new, so we are talking about centuries of thrown away knives.

    這個愛好是相當新的,所以我們說的是幾百年來被扔掉的刀。

  • Mortar shells, safes from robberies and jewelry has been found in the past.

    迫擊炮彈、被搶的保險箱和珠寶都曾被發現。

  • Probably the strangest thing pulled out happened in 2019.

    最奇怪的事情拉出來可能發生在2019年。

  • A magnet found some metal that turned out to be handcuffs...and they were still connected

    一塊磁鐵發現了一些金屬,原來是手銬......而且它們還連接在一起

  • to a 22-year old man...He was dead, obviously.

    到一個22歲的男人......他已經死了,顯然。

  • Now you need to watch, “Why It Would Suck To Live Through The End Of The Universe.”

    現在,你需要看,"為什麼它會吸活 通過宇宙的盡頭。"

  • Or, have a look at, “What If You Only Drank Coke (Soda) and Nothing Else?”

    或者,可以看看 "如果你只喝可樂(蘇打水),什麼都不喝呢?"

A young hospital porter in India is asked by a doctor to go get an oxygen mask, but

在印度,一個年輕的醫院搬運工被醫生要求去拿氧氣罩,但

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B1 中級 中文 磁鐵 特斯拉 磁場 恆星 金屬 地球

如果你把一個非常強大的磁鐵塞到你的頭上會怎麼樣? (What If You Stuck a Really Powerful Magnet to Your Head?)

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    林宜悉 發佈於 2021 年 03 月 05 日
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