2023考研英語閱讀天才的靈光
Einstein and car batteries
愛因斯坦和汽車電池
A spark of genius
天才的靈光
Without the magic of relativity, a car s startermotor would not turn
要不是相對論的魔力，汽車的發(fā)動馬達(dá)就轉(zhuǎn)不起來
ALBERT EINSTEIN never learned to drive.
阿爾伯特.愛因斯坦從沒去學(xué)開車。
He thought it too complicated and in any case he preferred walking. What he did notknowindeed, what no one knew until nowis that most cars would not work without theintervention of one of his most famous discoveries, the special theory of relativity.
他覺得開車太復(fù)雜，再者，他更喜歡走路。而他不知道的也是直到現(xiàn)在人們才知道的是沒有他的偉大發(fā)現(xiàn)之一，即狹義相對論，大多數(shù)汽車不可能發(fā)動起來。
Special relativity deals with physical extremes.
狹義相對論同物理極限相關(guān)。
It governs the behaviour of subatomic particles zipping around powerful accelerators atclose to the speed of light and its equations foresaw the conversion of mass into energy innuclear bombs.
該理論掌握了亞原子粒子在強(qiáng)大的加速器的作用下可以達(dá)到接近光速的速度這一表現(xiàn)行為。相對論的公式也預(yù)見了核彈中質(zhì)能轉(zhuǎn)換的現(xiàn)象。
A paper in Physical Review Letters, however, reports a more prosaic application.
然而，一篇發(fā)表在物理評論快報上的文章，講述了狹義相對論更為一般的應(yīng)用。
According to the calculations of PekkaPyykko of the University of Helsinki and his colleagues, the familiar lead-acid battery that sitsunder a car s bonnet and provides the oomph to get the engine turning owes its ability to doso to special relativity.
根據(jù)赫爾辛基大學(xué)的Pekka Pyykko和他同事們的計算，我們所熟悉的在汽車發(fā)動機(jī)罩下，給汽車引擎發(fā)動提供能量的鉛酸電池，它之所以有這樣的能力都?xì)w功于狹義相對論。
Relative values
相對的價值
The lead-acid battery is one of the triumphs of 19th-century technology.
鉛酸電池是19世紀(jì)技術(shù)發(fā)展的產(chǎn)物之一。
It was invented in 1860 and is still going strong.
它于1860年發(fā)明，迄今為止仍然具有很強(qiáng)的實用性。
Superficially, its mechanism is well understood. Indeed, it is the stuff of high-schoolchemistry books.
表面上，其機(jī)制為人熟知這些都是高中化學(xué)課本上的東西
But Dr Pyykko realised that there was a problem.
但Pyykko博士發(fā)覺了哪里不對勁。
In his view, when you dug deeply enough into the battery s physical chemistry, thatchemistry did not explain how it worked.
在他看來，越是深入研究電池的物理化學(xué)特性，這些化學(xué)特性反而越不能解釋電池到底是怎么工作的。
A lead-acid battery is a collection of cells, each of which contains two electrodes immersedin a strong solution of sulphuric acid.
鉛酸電池是電池單元構(gòu)成的集合，其中每個電池都有兩個電極，浸泡在硫酸溶液的電解液里。
One of the electrodes is composed of metallic lead, the other of porous lead dioxide.
金屬鉛充當(dāng)一處電極，另一處電極是多孔二氧化鉛。
In the parlance of chemists, metallic lead is electropositive.
化學(xué)家認(rèn)為，金屬鉛是電正性物質(zhì)。
This means that when it reacts with the acid, it tends to lose some of its electrons.
這表明，當(dāng)鉛和酸發(fā)生反應(yīng)時，它很可能失去一些電子。
Lead dioxide, on the other hand, is highly electronegative, preferring to absorb electrons inchemical reactions.
而另一方面，二氧化鉛是電負(fù)性物質(zhì)，在化學(xué)反應(yīng)中更喜歡吸收電子。
If a conductive wire is run between the two, electrons released by the lead will run through ittowards the lead dioxide, generating an electrical current as they do so.
如果把一根導(dǎo)電金屬絲放在金屬鉛和二氧化鉛之間，鉛釋放的電子會經(jīng)金屬絲傳遞到二氧化鉛，這個過程會產(chǎn)生電流。
The bigger the difference in the electropositivity and electronegativity of the materials thatmake up a battery s electrodes, the bigger the voltage it can deliver.
組成電池兩級的物質(zhì)的正負(fù)電荷差越大，他們發(fā)生化學(xué)反應(yīng)時產(chǎn)生的電伏數(shù)越大。
In the case of lead and lead dioxide, this potential difference is just over two volts per cell.
以鉛和二氧化鉛為例的電池，每節(jié)電池的電位差可產(chǎn)生2伏電壓。
That much has been known since the lead-acid battery was invented.
自鉛酸電池發(fā)明以來，上述的理論就已為人熟知。
However, although the properties of these basic chemical reactions have been measuredand understood to the nth degree, no one has been able to show from first principles exactlywhy lead and lead dioxide tend to be so electropositive and electronegative.
然而，盡管很大程度上我們都掌握和了解這些基礎(chǔ)化學(xué)反應(yīng)，卻沒有人能夠真正說明最根本的原理為什么鉛和二氧化鉛帶有這般的電正性和電負(fù)性呢?
This is a particular mystery because tin, which shares many of the features of lead, makeslousy batteries.
這一點顯得頗為神秘，因為和鉛特性差不大多的錫，無法用來做電池。
Metallic tin is not electropositive enough compared with the electronegativity of its oxide todeliver a useful potential difference.
比起鉛來，金屬錫的電正性沒有二氧化錫的電負(fù)性強(qiáng)，所以無法產(chǎn)生可用的電位差。
This is partly explained because the bigger an atom is, the more weakly its outer electronsare bound to it and hence the further those electrons are from the nucleus.
原子越大，其外層電子受原子束縛力越弱，這是解釋鉛和錫兩者差別的一部分原因。
In all groups of chemically similar elements the heaviest are the most electropositive.
在化學(xué)性質(zhì)相似的同族元素中，質(zhì)量越重帶的正電越強(qiáng)。
However, this is not enough to account for the difference between lead and tin.
然而這依然不能充分說明鉛和錫的差別。
To put it bluntly, classical chemical theory predicts that cars should not start in the morning.
直截了當(dāng)?shù)卣f， 古典化學(xué)理論預(yù)言了早上要離家上班汽車是發(fā)不動的。
Which is where Einstein comes in.
那愛因斯坦怎么被扯進(jìn)來了，
For, according to Dr Pyykko s calculations, relativity explains why tin batteries do not work,but lead ones do.
根據(jù)Pyykko博士的計算，相對論解釋了為什么鉛可以用來做電池，而錫不可以。
His chain of reasoning goes like this.
他一連串的理由是這樣解釋的。
Lead, being heavier than tin.
鉛比錫重，核子里的質(zhì)子數(shù)更多。
That means its nucleus has a stronger positive charge and that, in turn, means the electronsorbiting the nucleus are more attracted to it and travel faster, at roughly 60% of the speedof light, compared with 35% for the electrons orbiting a tin atom.
這表明原子核的正電更強(qiáng)，同理表明更容易吸引繞著原子核的電子，電子傳播的速度也更快，其速度是光速的60%，相比之下，繞著錫原子的電子速度只能達(dá)到光速的35%。
As the one Einsteinian equation everybody can quote, E=mc2, predicts, the kinetic energyof this extra velocity makes lead s electrons more massive than tin sand heavy electronstend to fall in and circle the nucleus in more tightly bound orbitals.
人人都會引用的愛因斯坦相對論公式：E=mc2，公式表明這一額外速度即更高的能量產(chǎn)生的動能使得鉛的電子比錫的更重不斷增加的質(zhì)量而重的電子往往會下落，圍著結(jié)合更緊密的原子核軌道繞行。
That has the effect of making metallic lead less electropositive than classical theory indicatesit should bewhich would tend to make the battery worse.
產(chǎn)生的結(jié)果是，金屬鉛的電正性沒有古典化學(xué)理論認(rèn)為的那么強(qiáng)看起來似乎鉛不適合用來做電池。
But this tendency is more than counterbalanced by an increase in the electronegativity oflead dioxide.
但是， 二氧化鉛電負(fù)性的增加不但全部抵消了這個趨勢還有剩余。
In this compound, the tightly bound orbitals act like wells into which free electrons can fall,allowing the material to capture them more easily. That makes lead dioxide much moreelectronegative than classical theory would predict.
在這個混合物里，結(jié)合緊密的軌道就像一口井，自由電子落入其中，使得物質(zhì)更容易捕獲電子。二氧化鉛的電負(fù)性其實比古典化學(xué)理論認(rèn)為的要更強(qiáng)。
And so it turned out.
然后他們得出了結(jié)論。
Dr Pyykko and his colleagues made two versions of a computer model of how lead-acidbatteries work.
Pyykko博士和他的同事們作了兩個版本的電腦模型，來觀察鉛酸電池是怎么工作的。
One incorporated their newly hypothesised relativistic effects while the other did not.
其中一個模型結(jié)合使用了相對論效應(yīng)的新假設(shè)，另一個沒有用。
The relativistic simulations predicted the voltages measured in real lead-acid batteries withgreat precision.
相對論模擬模型預(yù)測的鉛酸電池產(chǎn)生的電壓相當(dāng)精確。
When relativity was excluded, roughly 80% of that voltage disappeared.
而那個不用相對論的模型大約80%的電伏都沒有計算到。
That is an extraordinary finding, and it prompts the question of whether previouslyunsuspected battery materials might be lurking at the heavier end of the periodic table.
這是個非同凡響的發(fā)現(xiàn)，這個發(fā)現(xiàn)也提出了一個問題。是否還有以前沒想到的，潛伏在元素周期表末端的電池材料?
Ironically, today s most fashionable battery material, lithium, is the third-lightest elementin that tableand therefore one for which no such relativistic effects can be expected.
諷刺的是，現(xiàn)在最時髦的電池材料，鋰，是周期表中第三輕的元素如果用相對論效應(yīng)是料不到它可以用來做電池。
And lead is about as heavy as it gets before elements become routinely radioactive and thusinappropriate for all but specialised applications.
鉛是周期表中放射性元素之前最重的元素，因此除了用于專門應(yīng)用外不適用于他處。
Still, the search for better batteries is an endless one, and Dr Pyykko s discovery mightprompt some new thinking about what is possible in this and other areas of heavy-elementchemistry.
而有關(guān)更好的電池材料的研究是沒有止境的，Pyykko博士的發(fā)現(xiàn)也許給我們提供了一些新的思考方向化學(xué)重金屬在電池和其他地方還有什么作為?
詞語解釋
1.relativity n.相對性;相對論
They teach the relativity of all ethical ideas.
他們宣揚一切道德觀念的相對性。
2.intervention n.介入;干預(yù)
His untimely intervention annoyed me.
他那不合時宜的干涉讓我生氣。
3.particle n.顆粒;微粒;極小量
We can see the dust particles floating in the sunlight clearly.
我們可以很清楚地看到陽光下的灰塵顆粒。
4.equation n.相等;均衡
I can t make this equation come out.
我不會解這個方程式。
5.prosaic a.單調(diào)乏味的;散文的
It was a prosaic description of the scene.
這是對場景沒有想象力的一個描述。
Einstein and car batteries
愛因斯坦和汽車電池
A spark of genius
天才的靈光
Without the magic of relativity, a car s startermotor would not turn
要不是相對論的魔力，汽車的發(fā)動馬達(dá)就轉(zhuǎn)不起來
ALBERT EINSTEIN never learned to drive.
阿爾伯特.愛因斯坦從沒去學(xué)開車。
He thought it too complicated and in any case he preferred walking. What he did notknowindeed, what no one knew until nowis that most cars would not work without theintervention of one of his most famous discoveries, the special theory of relativity.
他覺得開車太復(fù)雜，再者，他更喜歡走路。而他不知道的也是直到現(xiàn)在人們才知道的是沒有他的偉大發(fā)現(xiàn)之一，即狹義相對論，大多數(shù)汽車不可能發(fā)動起來。
Special relativity deals with physical extremes.
狹義相對論同物理極限相關(guān)。
It governs the behaviour of subatomic particles zipping around powerful accelerators atclose to the speed of light and its equations foresaw the conversion of mass into energy innuclear bombs.
該理論掌握了亞原子粒子在強(qiáng)大的加速器的作用下可以達(dá)到接近光速的速度這一表現(xiàn)行為。相對論的公式也預(yù)見了核彈中質(zhì)能轉(zhuǎn)換的現(xiàn)象。
A paper in Physical Review Letters, however, reports a more prosaic application.
然而，一篇發(fā)表在物理評論快報上的文章，講述了狹義相對論更為一般的應(yīng)用。
According to the calculations of PekkaPyykko of the University of Helsinki and his colleagues, the familiar lead-acid battery that sitsunder a car s bonnet and provides the oomph to get the engine turning owes its ability to doso to special relativity.
根據(jù)赫爾辛基大學(xué)的Pekka Pyykko和他同事們的計算，我們所熟悉的在汽車發(fā)動機(jī)罩下，給汽車引擎發(fā)動提供能量的鉛酸電池，它之所以有這樣的能力都?xì)w功于狹義相對論。
Relative values
相對的價值
The lead-acid battery is one of the triumphs of 19th-century technology.
鉛酸電池是19世紀(jì)技術(shù)發(fā)展的產(chǎn)物之一。
It was invented in 1860 and is still going strong.
它于1860年發(fā)明，迄今為止仍然具有很強(qiáng)的實用性。
Superficially, its mechanism is well understood. Indeed, it is the stuff of high-schoolchemistry books.
表面上，其機(jī)制為人熟知這些都是高中化學(xué)課本上的東西
But Dr Pyykko realised that there was a problem.
但Pyykko博士發(fā)覺了哪里不對勁。
In his view, when you dug deeply enough into the battery s physical chemistry, thatchemistry did not explain how it worked.
在他看來，越是深入研究電池的物理化學(xué)特性，這些化學(xué)特性反而越不能解釋電池到底是怎么工作的。
A lead-acid battery is a collection of cells, each of which contains two electrodes immersedin a strong solution of sulphuric acid.
鉛酸電池是電池單元構(gòu)成的集合，其中每個電池都有兩個電極，浸泡在硫酸溶液的電解液里。
One of the electrodes is composed of metallic lead, the other of porous lead dioxide.
金屬鉛充當(dāng)一處電極，另一處電極是多孔二氧化鉛。
In the parlance of chemists, metallic lead is electropositive.
化學(xué)家認(rèn)為，金屬鉛是電正性物質(zhì)。
This means that when it reacts with the acid, it tends to lose some of its electrons.
這表明，當(dāng)鉛和酸發(fā)生反應(yīng)時，它很可能失去一些電子。
Lead dioxide, on the other hand, is highly electronegative, preferring to absorb electrons inchemical reactions.
而另一方面，二氧化鉛是電負(fù)性物質(zhì)，在化學(xué)反應(yīng)中更喜歡吸收電子。
If a conductive wire is run between the two, electrons released by the lead will run through ittowards the lead dioxide, generating an electrical current as they do so.
如果把一根導(dǎo)電金屬絲放在金屬鉛和二氧化鉛之間，鉛釋放的電子會經(jīng)金屬絲傳遞到二氧化鉛，這個過程會產(chǎn)生電流。
The bigger the difference in the electropositivity and electronegativity of the materials thatmake up a battery s electrodes, the bigger the voltage it can deliver.
組成電池兩級的物質(zhì)的正負(fù)電荷差越大，他們發(fā)生化學(xué)反應(yīng)時產(chǎn)生的電伏數(shù)越大。
In the case of lead and lead dioxide, this potential difference is just over two volts per cell.
以鉛和二氧化鉛為例的電池，每節(jié)電池的電位差可產(chǎn)生2伏電壓。
That much has been known since the lead-acid battery was invented.
自鉛酸電池發(fā)明以來，上述的理論就已為人熟知。
However, although the properties of these basic chemical reactions have been measuredand understood to the nth degree, no one has been able to show from first principles exactlywhy lead and lead dioxide tend to be so electropositive and electronegative.
然而，盡管很大程度上我們都掌握和了解這些基礎(chǔ)化學(xué)反應(yīng)，卻沒有人能夠真正說明最根本的原理為什么鉛和二氧化鉛帶有這般的電正性和電負(fù)性呢?
This is a particular mystery because tin, which shares many of the features of lead, makeslousy batteries.
這一點顯得頗為神秘，因為和鉛特性差不大多的錫，無法用來做電池。
Metallic tin is not electropositive enough compared with the electronegativity of its oxide todeliver a useful potential difference.
比起鉛來，金屬錫的電正性沒有二氧化錫的電負(fù)性強(qiáng)，所以無法產(chǎn)生可用的電位差。
This is partly explained because the bigger an atom is, the more weakly its outer electronsare bound to it and hence the further those electrons are from the nucleus.
原子越大，其外層電子受原子束縛力越弱，這是解釋鉛和錫兩者差別的一部分原因。
In all groups of chemically similar elements the heaviest are the most electropositive.
在化學(xué)性質(zhì)相似的同族元素中，質(zhì)量越重帶的正電越強(qiáng)。
However, this is not enough to account for the difference between lead and tin.
然而這依然不能充分說明鉛和錫的差別。
To put it bluntly, classical chemical theory predicts that cars should not start in the morning.
直截了當(dāng)?shù)卣f， 古典化學(xué)理論預(yù)言了早上要離家上班汽車是發(fā)不動的。
Which is where Einstein comes in.
那愛因斯坦怎么被扯進(jìn)來了，
For, according to Dr Pyykko s calculations, relativity explains why tin batteries do not work,but lead ones do.
根據(jù)Pyykko博士的計算，相對論解釋了為什么鉛可以用來做電池，而錫不可以。
His chain of reasoning goes like this.
他一連串的理由是這樣解釋的。
Lead, being heavier than tin.
鉛比錫重，核子里的質(zhì)子數(shù)更多。
That means its nucleus has a stronger positive charge and that, in turn, means the electronsorbiting the nucleus are more attracted to it and travel faster, at roughly 60% of the speedof light, compared with 35% for the electrons orbiting a tin atom.
這表明原子核的正電更強(qiáng)，同理表明更容易吸引繞著原子核的電子，電子傳播的速度也更快，其速度是光速的60%，相比之下，繞著錫原子的電子速度只能達(dá)到光速的35%。
As the one Einsteinian equation everybody can quote, E=mc2, predicts, the kinetic energyof this extra velocity makes lead s electrons more massive than tin sand heavy electronstend to fall in and circle the nucleus in more tightly bound orbitals.
人人都會引用的愛因斯坦相對論公式：E=mc2，公式表明這一額外速度即更高的能量產(chǎn)生的動能使得鉛的電子比錫的更重不斷增加的質(zhì)量而重的電子往往會下落，圍著結(jié)合更緊密的原子核軌道繞行。
That has the effect of making metallic lead less electropositive than classical theory indicatesit should bewhich would tend to make the battery worse.
產(chǎn)生的結(jié)果是，金屬鉛的電正性沒有古典化學(xué)理論認(rèn)為的那么強(qiáng)看起來似乎鉛不適合用來做電池。
But this tendency is more than counterbalanced by an increase in the electronegativity oflead dioxide.
但是， 二氧化鉛電負(fù)性的增加不但全部抵消了這個趨勢還有剩余。
In this compound, the tightly bound orbitals act like wells into which free electrons can fall,allowing the material to capture them more easily. That makes lead dioxide much moreelectronegative than classical theory would predict.
在這個混合物里，結(jié)合緊密的軌道就像一口井，自由電子落入其中，使得物質(zhì)更容易捕獲電子。二氧化鉛的電負(fù)性其實比古典化學(xué)理論認(rèn)為的要更強(qiáng)。
And so it turned out.
然后他們得出了結(jié)論。
Dr Pyykko and his colleagues made two versions of a computer model of how lead-acidbatteries work.
Pyykko博士和他的同事們作了兩個版本的電腦模型，來觀察鉛酸電池是怎么工作的。
One incorporated their newly hypothesised relativistic effects while the other did not.
其中一個模型結(jié)合使用了相對論效應(yīng)的新假設(shè)，另一個沒有用。
The relativistic simulations predicted the voltages measured in real lead-acid batteries withgreat precision.
相對論模擬模型預(yù)測的鉛酸電池產(chǎn)生的電壓相當(dāng)精確。
When relativity was excluded, roughly 80% of that voltage disappeared.
而那個不用相對論的模型大約80%的電伏都沒有計算到。
That is an extraordinary finding, and it prompts the question of whether previouslyunsuspected battery materials might be lurking at the heavier end of the periodic table.
這是個非同凡響的發(fā)現(xiàn)，這個發(fā)現(xiàn)也提出了一個問題。是否還有以前沒想到的，潛伏在元素周期表末端的電池材料?
Ironically, today s most fashionable battery material, lithium, is the third-lightest elementin that tableand therefore one for which no such relativistic effects can be expected.
諷刺的是，現(xiàn)在最時髦的電池材料，鋰，是周期表中第三輕的元素如果用相對論效應(yīng)是料不到它可以用來做電池。
And lead is about as heavy as it gets before elements become routinely radioactive and thusinappropriate for all but specialised applications.
鉛是周期表中放射性元素之前最重的元素，因此除了用于專門應(yīng)用外不適用于他處。
Still, the search for better batteries is an endless one, and Dr Pyykko s discovery mightprompt some new thinking about what is possible in this and other areas of heavy-elementchemistry.
而有關(guān)更好的電池材料的研究是沒有止境的，Pyykko博士的發(fā)現(xiàn)也許給我們提供了一些新的思考方向化學(xué)重金屬在電池和其他地方還有什么作為?
詞語解釋
1.relativity n.相對性;相對論
They teach the relativity of all ethical ideas.
他們宣揚一切道德觀念的相對性。
2.intervention n.介入;干預(yù)
His untimely intervention annoyed me.
他那不合時宜的干涉讓我生氣。
3.particle n.顆粒;微粒;極小量
We can see the dust particles floating in the sunlight clearly.
我們可以很清楚地看到陽光下的灰塵顆粒。
4.equation n.相等;均衡
I can t make this equation come out.
我不會解這個方程式。
5.prosaic a.單調(diào)乏味的;散文的
It was a prosaic description of the scene.
這是對場景沒有想象力的一個描述。
