科学家称：远古时代男主内女主外
<p><span word="Scientists">Scientists</span> <span word="may">may</span> <span word="finally">finally</span> <span word="have">have</span> <span word="confirmed">confirmed</span> <span word="what">what</span> <span word="every">every</span> <span word="woman">woman</span> <span word="has">has</span> <span word="always">always</span> <span word="suspected">suspected</span>. <span word="Even">Even</span> <span word="back">back</span> <span word="in">in</span> <span word="prehistoric">prehistoric</span> <span word="times">times</span>, <span word="the">the</span> <span word="female">female</span> <span word="of">of</span> <span word="the">the</span> <span word="species">species</span> <span word="was">was</span> <span word="very">very</span> <span word="much">much</span> <span word="the">the</span> <span word="boss">boss</span>. <span word="A">A</span> <span word="study">study</span> <span word="has">has</span> <span word="found">found</span> <span word="evidence">evidence</span> <span word="of">of</span> "<span word="alpha">alpha</span> <span word="cavewomen">cavewomen</span>" <span word="roaming">roaming</span> <span word="the">the</span> <span word="plains">plains</span> <span word="and">and</span> <span word="calling">calling</span> <span word="the">the</span> <span word="shots">shots</span> <span word="while">while</span> <span word="the">the</span> <span word="menfolk">menfolk</span> <span word="slobbed">slobbed</span> <span word="at">at</span> <span word="home">home</span>。</p><p><span word="Alpha">Alpha</span> <span word="cavewoman">cavewoman</span> <span word="appears">appears</span> <span word="to">to</span> <span word="have">have</span> <span word="travelled">travelled</span> <span word="far">far</span> <span word="wider">wider</span> <span word="than">than</span> <span word="her">her</span> <span word="male">male</span> <span word="counterpart">counterpart</span>, <span word="the">the</span> <span word="research">research</span> <span word="showed">showed</span>. <span word="She">She</span> <span word="might">might</span> <span word="even">even</span> <span word="have">have</span> <span word="been">been</span> <span word="the">the</span> <span word="one">one</span> <span word="who">who</span> <span word="went">went</span> <span word="out">out</span> <span word="clubbing">clubbing</span>, <span word="so">so</span> <span word="to">to</span> <span word="speak">speak</span> – <span word="reversing">reversing</span> <span word="the">the</span> <span word="popular">popular</span> <span word="conception">conception</span> <span word="that">that</span> <span word="it">it</span> <span word="was">was</span> <span word="the">the</span> <span word="bloke">bloke</span> <span word="who">who</span> <span word="bashed">bashed</span> <span word="the">the</span> <span word="girl">girl</span> <span word="on">on</span> <span word="the">the</span> <span word="head">head</span> <span word="and">and</span> <span word="dragged">dragged</span> <span word="her">her</span> <span word="home">home</span> <span word="by">by</span> <span word="the">the</span> <span word="hair">hair</span>。</p><p><span word="But">But</span> <span word="something">something</span> <span word="seems">seems</span> <span word="to">to</span> <span word="have">have</span> <span word="happened">happened</span> <span word="to">to</span> <span word="the">the</span> <span word="evolution">evolution</span> <span word="of">of</span> <span word="the">the</span> <span word="species">species</span> <span word="after">after</span> <span word="those">those</span> <span word="times">times</span> <span word="between">between</span> 1.7<span word="million">million</span> <span word="and">and</span> 2.4<span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>. <span word="A">A</span> <span word="couple">couple</span> <span word="more">more</span> <span word="millennia">millennia</span> <span word="would">would</span> <span word="have">have</span> <span word="to">to</span> <span word="pass">pass</span> <span word="before">before</span> <span word="female">female</span> <span word="independence">independence</span> <span word="re">re</span>-<span word="emerged">emerged</span> <span word="with">with</span> <span word="the">the</span> <span word="liberation">liberation</span> <span word="of">of</span> <span word="the">the</span> <span word="Swinging">Swinging</span> <span word="Sixties">Sixties</span>。</p><p><span word="The">The</span> <span word="findings">findings</span>, <span word="detailed">detailed</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Nature">Nature</span>, <span word="were">were</span> <span word="made">made</span> <span word="by">by</span> <span word="Oxford">Oxford</span> <span word="University">University</span> <span word="researchers">researchers</span> <span word="and">and</span> <span word="an">an</span> <span word="international">international</span> <span word="team">team</span> <span word="of">of</span> <span word="scientists">scientists</span>. <span word="Using">Using</span> <span word="lasers">lasers</span> <span word="and">and</span> <span word="advanced">advanced</span> <span word="technology">technology</span>, <span word="they">they</span> <span word="analyzed">analyzed</span> <span word="enamel">enamel</span> <span word="from">from</span> <span word="fossilized">fossilized</span> <span word="teeth">teeth</span> <span word="found">found</span> <span word="in">in</span> <span word="cave">cave</span> <span word="systems">systems</span> <span word="in">in</span> <span word="South">South</span> <span word="Africa">Africa</span>。</p><p><span word="Oxford">Oxford</span> <span word="professor">professor</span> <span word="Julia">Julia</span> <span word="Lee">Lee</span>-<span word="Thorp">Thorp</span> <span word="said">said</span> <span word="the">the</span> <span word="difference">difference</span> <span word="between">between</span> <span word="males">males</span> <span word="and">and</span> <span word="females">females</span> <span word="was">was</span> "<span word="completely">completely</span> <span word="unexpected">unexpected</span>"。</p><p><span word="Her">Her</span> <span word="team">team</span> <span word="measured">measured</span> <span word="the">the</span> <span word="strontium">strontium</span> <span word="isotope">isotope</span> <span word="ratios">ratios</span> <span word="in">in</span> <span word="canine">canine</span> <span word="and">and</span> <span word="third">third</span> <span word="molar">molar</span> <span word="teeth">teeth</span> <span word="in">in</span> 11 <span word="Paranthropus">Paranthropus</span> <span word="individuals">individuals</span> <span word="from">from</span> <span word="the">the</span> <span word="Swartkrans">Swartkrans</span> <span word="cave">cave</span>, <span word="as">as</span> <span word="well">well</span> <span word="as">as</span> <span word="in">in</span> <span word="teeth">teeth</span> <span word="from">from</span> <span word="eight">eight</span> <span word="Australopithecus">Australopithecus</span> <span word="africanus">africanus</span> <span word="individuals">individuals</span> <span word="from">from</span> <span word="the">the</span> <span word="nearby">nearby</span> <span word="Sterkfontein">Sterkfontein</span> <span word="cave">cave</span>. <span word="The">The</span> <span word="researchers">researchers</span> <span word="also">also</span> <span word="measured">measured</span> <span word="the">the</span> <span word="strontium">strontium</span> <span word="in">in</span> 170 <span word="plants">plants</span> <span word="and">and</span> <span word="animals">animals</span> <span word="currently">currently</span> <span word="living">living</span> <span word="near">near</span> <span word="the">the</span> <span word="caves">caves</span> <span word="to">to</span> <span word="get">get</span> <span word="a">a</span> <span word="sense">sense</span> <span word="of">of</span> <span word="the">the</span> <span word="different">different</span> <span word="strontium">strontium</span> <span word="signatures">signatures</span> <span word="of">of</span> <span word="the">the</span> <span word="region">region</span>。</p>
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