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˵˵ѧʱҡԺʿ

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ѧʱԡҡԺʿΪɾܾ˺¡Ƽ
ǿƼ󿯡ⲻò˴Ħҡֱĺ⡣
Ժʿأ¡ѧʱԼӣҲǺߵؾ
ɣΪԺʿΪԺʿԸģѧʱǰǴ
Ժʿģ

Ƕ֪ѧҪɺСѧʱֻᴵ
ɣǻܳѧʱ

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κáʯԽ 
 
ߣ⳯

һϹĹеǲ

ϹĹƷС嵥嵥Ϊǲᡱǲ
ߡܲĹ֮ǰ֪ǲ߶򣬵ƷıľƵġ
ͷСżɽĹ򡷣гǲƷ֣ժ£ 

нһһڴһйһcһcһ
عڡȹڸһһһЖһһһìһöߣ
һһйܣ

ѺĹġǲߡƷ֣Ʒ϶ľʱƣ
Ժ͡ǲߡա硰ǲߡСһҡ327
ʢһСӡľǡ

˲ܲĹʯƷıƣԼ60ǡƶ
һ࣬ǲᡱеĿơżɽĹЩƷ
硰ڴһעйһעйܡ˵ƷҪ
˵ʱǿԼ˵ġܲĹʯСκֵģǡκ
XXXXҲƷƣΪƷ֮һ
رϺ׵

ʯϵġκ

κֳΪר϶ܲĹӲ֤ݣΪ䡱ֺţ
Ĺв֡ʵδȻ

ܲٵá䡱ֺǰںֺǿԳĹ
еġңܲٳԼƽΪûԼ֪м˳
˳Ƶۡȷԡ䡱ڼġٶңܲȨ׵ۡ
衱ֺȻԼˣˣκ֮Ƹʱ
ĹС֣ܲͨ䡷˵⡰κʯƻ
ּء

ʯϵġá

κûʲôˣһǡááȷʵ
ǳĺ﷨ڹźȴǺϷģΪ֤

ϳ飮˼أݳͭҩ£
öȸ˼Ի˫ȸ棬䲻ʱ˼͢ξϵ
зˣԡݳáǡȥùġ
˼ġǡҲǡڹͨ٣
ҹ˲ܼƽϵĸ˼ḮԪ꡷ιʱдɡ
ݳá

ϴ˵䣬˵֮νǿҲ䳢ò
ʯʾҡҽ֮йضֹԻ˲¾ʯ
ãġáҲʧȥĺ塣

˲ô֡ȥ롰ȥƺҲдӢ
еġused toԡáġȥʽȥ
﷨֣˼롰á൱ʵϣ˴ҲСȥ
˼ӢʽӢUsed you to be a teacher?ӡ
1963桶Ӣʵ䡷1104ҳ˼ǡȥʦ𣿡˵
ȥǡȥأ

ˣǲӢ˶˵ǣܲĹеʯƱݾ
ɡʯƵĳַϺ׵κƺųֺϺ߼
áĹ﷨

ġ˭

ҾӦ˵УɡǿԵġͬ
УҪʡĻáΡݱУҲ˵
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ζȾһ

ߣŶ

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֧ʱȥ֫żʡҽ¹ʣҪҽ
һԱҲΡΪҽߵȨ棬ʩҽԺ
ֶⷽϸĹ涨ÿ궼ԱҽԺȫ飬һ
صǿҽԺζžһҹ淶

Ȳδǰҽڲѵ£Ѳػʿ
£ѯʲۻۣȻȣ
ѲػʿƤʽҽλƤǣǱ
ڲȫ̽ǺȻȻ׼ʿٰ¼Уԣ
󣬻ʿŻѲƽҡ

ҺҽǰѲػʿȫ
ͣxxxxۣȣŹؽڡȻҽ
϶ӦۣȣŹؽڡҽ϶Ӧ
ȣŹؽڡ̨еʿ϶Ӧ
ȣŹؽڡ֮СѲػʿ
ִڲϼ¼

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Ȼأڳƣ϶ҽƼƲáҽǣ
˼,ʩˡ

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ظҽԺڰдŵдġ

ߣshujuan

ĳЩѧԺƼԱرоӰ
༭д㽨Ը־ǵĳƪдʲôģȻʹ
ԼNature, ScienceLancent﷢ģ
Щֻаһpageletter or commentȥƪ㲩ʿĻࡣ
˸Ӱӵԭ(original article)Ǿڵǰһ
ϸЩı༭С飬дСۡشһΪ
ƭȡĿҽԺΪͻȫ֮
ƣйѧһУα뵽㣡

(XYS20100104)

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йԴ۵һʵ

й2009-12-30

йԴƵѶ2009223գһƾձ״
йˮ繤ѧḱ鳤ŲͥȨڱԺһ
οͥһ׮ƷǳСİˮҵںڶԴصýȦ
ڣȴȻ󲨡ӰͥԴ¼Ϊ⣬ָ
ѧ߱䡰øգ߲ɷ˫Լרңڽʾ
鱳ࡣ



20071220գһƾձڵձֽϷΪˮ
翪ýˡ700ֵһƪҪ۵йˮ緢չȣ
ӾϡܼˮվӾƣ͡⣬ˡˮרҡ
Ĺ۵㡰ҹ󲿷ֺˮԴ̶ȸߴ80%ϣĴϵϵ
һЩˮԴ̶ߴ100%Ϊйˮ翪عȣ
Ѿ̬ѡ

20071224գ ΪˮڲйԼĲз
Ϊ᲻Ҫ֪޳ܵɫĲ¡ǿĿǰйˮ翪
ԶԶڹ⣬ʹڹҥйˮ硣ڲУ
йˮ繤ѧḱ鳤ڸ߹ݺȻĿ

ƪΪ1873Ρظ74Ĳ£Ϊһֽ״
йˮ繤ѧḱ鳤ŲͥϷͥҪ֤ݡ״гƣ
棨Ųͥڲ粩Ͷԭ汾衢̰
Դߴ֮ࡣ״Ϊ1Ǹ
Ӱ죻2⳥ʧһԪ3еϷѺԭĹ֤Լ
ʦѡ

ԸˡȨŲͥ෴ŲͥΪԼΪ˽¶ҥ
ԡάվڱϯϣʾΪ˹ⳡ˾
ס

ڷͥϣѽڱϯĶŵŲͥһϵԴǼҡʷ
ϬĲ߻ϵȺšڷͥ˫ʦ֮һ󷨹
ûиŲͥԭ۵ĻʱҴҽͥͥŲͥ
˼רáŲ̹ͥ£Ȼ˵ĽǶȣҲʶ𣬸ܺ
κθ˶Թдͽ¶ҥΪ˹棬ⳡ˾ΪйԴ
չԷչΪйʵĿԴ򣡡

йɫѡһһ
̨7ίϷҪͶƱһһȵĻ2007
ѡŲͥһЩýҥйˮ翪Ļߣ
ȻҲѡɫеǳԾ 

йزŽҷٵͬʱŲͥϷˡ᲻Ҫ֪
ܵɫ£ϣͶƱѵľ
һƾձĳλˮʦġ϶Ժˮ
ԴĿһ40%ĳ̶ȣĿǰҹ󲿷ֺˮԴ̶ȸߴ
80%ϣĴϵϵһЩˮԴ̶ߴ100%
ۣŲͥϣͨϴﵽҥԣֹαѡɫ
ٶȳ֡

һƾŲͥдһЩʶ
Ȩϡ䷨Ժ𰸼ԡ˸ɣо
ŲͥΪΥ

ŲͥԼ߳Ѿͥύվϣ
ô󸱱ʹҥ֪޳֤ܵݣԣͥûое
֪޳ܡ˵˸񣬶ΪʹáͿ桯
֪ܡ͡ǡȴʻ㹹ΥҲ֪ڷ޳ܵҥ
֪ܵĺ˵˵ʲôΪʲôһ˵ǺϷģһ
Υģ

⣬粩̳ϵȨ⣬ĿǰϻûȷĹ涨
ϣ˰оΪ̳͵Ȩ̽һ;
Ȼ䷨ԺоĽȴʮֳԾմ˰о߼
̳Ͳ϶ڸָУͿ桱һĴʻ㶼
׼ʹãô󼸺øݴʶһǾԲʹˡ
򣬾Ǳ˸ΥΪǲҪʣϲ
ӦЩʻ㣬ôֵϵЩʻ㻹ܵȥϷӦãо
ǲѾİʹøʻɣǲһΥܷ
о

࣬ŲͥΪԼԴǼ˻ʿйˮ
ֱԭ˵ˮʵѾãҹϿʮ
ΧһֱѧΧڡ2004꣬Ųͥһƪ
ŭʡй걨ŲͥԼƪµпϣ޹
֮ԣй걨Ϸƪ£ļ
йˮ֮ɴ

滷롰α

ʼŲͥΪһѧߣΪκԴʱŲͥ˵
ܶˮרΪæǱѧڡαʿûгʶ۵
ΪмۣǰԼҲġڹˮҵרҵԷ
ǿһҵαʿһ㣬͵ϵ
״һζˮ翪õȺͼƬɿɺ幫
ڣʹྭѧ֤ˮ繤̳޷ŭˮ翪ǵ
͵֤ŲͥεĿʼûԼȥŲͥڲ
йˮ彨͹з֣ýûͳֽý
һǳϽı༭У̣ʱԴǼһЩ·ܹﵽ
עЧ֮⣬Լлֱ˵ķʽҲϲ
ʹü̴ʻ˵Ҫԭ

Ųͥرἰ͵ġˮԴ͡ˮԴˮԴ
ָˮռˮԴıʣֵˮԴ
õĳ̶ȡˮԴָˮԴãˮĶܡܺѹ
ܵԴȻĳкǱڵˮԴ
ˮԴˮԴˮˮӸߴ䵽ʹ
ʱˮλʹ󣬼̲صˮԴ󡣾
ձһˮԼ70%ջתˮ
ϵͳˣˮԴʳ40%ôʹԼ28%ˮ
ԭ60%δʹùĺˮںϣͼһˮ
ˣΪˮԴʹһ40%ǾͻΪѾԺ
˱ȽصȾԣΪˮԴó̶Ȳ˳
40%ɼƼȲˮԴ̶ȣӦðˮܣˮ磩
̶ȡһʶԵĸŲͥ˼궼ûֹαʿ
ҥԡ

֪ʷԭйԴú̿ΪŸĸ￪
󾭼õķٷչԴվǽЩ꣬Ծ÷չ
жԴãú̿ʯ͵һԻʯԴԻɵȾԼһ
Щض¼ķĹ㷺עڷչй
й̫ܵԴڼԭʱ޷Χʹã
ʵĿԴˮܡҹˮԴḻ̲6ǧ
ʱɿ2.47ǧʱÿɿ1.75ǧʱˮ
Դ̲ǿܿˮԴйһλǣ뷢
ȣйˮԴó̶ȲߡŲͥΪ൱
ÿ춼㵹ٶԭú

ŲͥΪչйˮ󻷱

Ϊ˭

87գ䷨ԺһооŲͥȨΪڡ
ŲͥԴоȫΪ䷨ԺоһΥܷĴ
Ҫйط泷о

ŲͥܣѾ֣ͨصйزŷӳԺ
ΥоֱİܷȨ⡣

Դ˰ѯйѧУűűΪŲͥ
ڲģӦڡṩŲϣʹܵ
Ӧ϶ΪֺȨΪ֪ԼĲ»
ýתء

ҲרΪűԺõķǵݡŲͥ
òͽ¶ɫѡе⣬ṩŲϵˣ
ӦøбǷ񹹳ȨŲͥΪ˽ˮרң
ԼĲϽ¶ҥǶԹڻʹලȨ
ʹܷ蹫ĺϷȨΪֻҪҷʵͲΪ
ˣݵĹ涨ܴκȨ⡣

űΪŲͥΪԼΪ˹ϱϯ
¹۵ʵȨ֧ţ ǣЩĨɱȨʵ
衢̰ȷʽ𺦹񡢷˵Ƿɹ涨ҪڱУ
Щʵ϶

רΪѸݴ̰ϵκ˲
κ£һʹЩݴʾһṹȨôǵĻ
оͲӦô첢Щʻ㡣¶ʹⶼͷ
ķ룬ڷýͳϡˣ͹۵˶Ϊ
ͥ¶ҥά¶ҥԵΪģ̰ҥߵ
ΥɵҪ

ʼΪ粩£µϺʹͳý
кܴͬйлһصԿǡһʱű
̸Ǹ⣬粩ȷʵͬʽý壬ˣŲͥ
ҲдʶƺдԼռǡռǺͲµǡǡ
ڲǸԼǸ˿𵽡衢̰ȷʽ𺦹񡢷˵
ãǷɹ涨Ҫ

߲ɷʱзרΪǸǹʹ
ȨලȨҪ塣ḯԼðαӵĽ¶
һɵı֣ͬʱҲʹԸмεŵļලȨ
ʵЩõֵ֧ĸ˵ȴ
Ǵ磬ḯΪʹ⡢Լðα
Ϊķ߿ȣʵϣͷŭǡǡͨһ
ҪʽЩڹҪҪֻعģȴ
һЩòֵ֧ķΪ磬Ϊάṫ棬
Ҽ١ٵķӣ;⵽Ȩϡǣټӷ
ЩˡΪɣЩ¶ٵˣ
͵òۡˣ϶ĴоһҪ
أ㲻𵽴ĸá人ĳԺ
Ф߷Ȩһº600֪ʶӵ
顣Ӱ켫ӣҹ˾ɼӰ졣֮ҹڼ
⣬͹ҥ̰Ϊڹ
ҷҪرעⱣЧķӳලá

20091215գеһмԺԴ˰ˡߣά
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ӦӼݹⷢţַ֪ȨΥ
ȵڡ°䲼ġȨηʮ͵ʮһŲͥ
ΪԼòͽ¶ʹҥߵȫȨηеġ
͡աķҪزʶԹ޳£׫д
ҥȨĲͣȫͼСҥԶԹ֪Ȩ˺ͲӰ
ҪάṫΪˬ

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