Ancestor of all flowers revealed by scientists 科学家揭示花卉“祖先”的样貌
<p><span word="Ancestor">Ancestor</span> <span word="of">of</span> <span word="all">all</span> <span word="flowers">flowers</span> <span word="revealed">revealed</span> <span word="by">by</span> <span word="scientists">scientists</span> 科学家揭示花卉“祖先”的样貌</p><p> 一项发表在《自然通讯》杂志上的研究表明，地球上现存的所有花卉植物都可以追溯到1.4 亿年前的同一个“祖先”。科学家们通过计算机将花卉演化的模型与现存最大的鲜花特征数据库组合在一起，推测出地球上第一朵花的样貌。请听报道。</p><p><span word="From">From</span> <span word="roses">roses</span> <span word="and">and</span> <span word="lilies">lilies</span> <span word="to">to</span> <span word="cherry">cherry</span> <span word="trees">trees</span> <span word="and">and</span> <span word="wheat">wheat</span>, <span word="there">there</span> <span word="are">are</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="species">species</span> <span word="of">of</span> <span word="flowering">flowering</span> <span word="plants">plants</span>, <span word="and">and</span> <span word="every">every</span> <span word="single">single</span> <span word="one">one</span> <span word="of">of</span> <span word="them">them</span> <span word="traces">traces</span> <span word="back">back</span> <span word="to">to</span> <span word="a">a</span> <span word="single">single</span> <span word="ancestral">ancestral</span> <span word="flower">flower</span> <span word="that">that</span> <span word="grew">grew</span> 140 <span word="million">million</span> <span word="years">years</span> <span word="ago">ago</span>.</p><p><span word="Now">Now</span> <span word="by">by</span> <span word="analysing">analysing</span> <span word="the">the</span> <span word="evolutionary">evolutionary</span> <span word="differences">differences</span> <span word="between">between</span> <span word="living">living</span> <span word="species">species</span> <span word="to">to</span> <span word="track">track</span> <span word="how">how</span> <span word="the">the</span> <span word="floral">floral</span> <span word="features">features</span> <span word="have">have</span> <span word="changed">changed</span> <span word="over">over</span> <span word="time">time</span>, <span word="scientists">scientists</span> <span word="have">have</span> <span word="been">been</span> <span word="able">able</span> <span word="to">to</span> <span word="reconstruct">reconstruct</span> <span word="this">this</span> <span word="ancient">ancient</span> <span word="bloom">bloom</span>’<span word="s">s</span> <span word="appearance">appearance</span>. <span word="And">And</span> <span word="instead">instead</span> <span word="of">of</span> <span word="the">the</span> <span word="primitive">primitive</span>-<span word="looking">looking</span> <span word="species">species</span> <span word="they">they</span> <span word="were">were</span> <span word="expecting">expecting</span>, <span word="a">a</span> <span word="complex">complex</span>, <span word="multi">multi</span>-<span word="part">part</span> <span word="organism">organism</span> <span word="has">has</span> <span word="emerged">emerged</span>.</p><p><span word="The">The</span> <span word="flower">flower</span> <span word="had">had</span> <span word="concentric">concentric</span> <span word="circles">circles</span> <span word="of">of</span> <span word="petal">petal</span>-<span word="like">like</span> <span word="features">features</span> <span word="which">which</span> <span word="are">are</span> <span word="grouped">grouped</span> <span word="in">in</span> <span word="sets">sets</span> <span word="of">of</span> <span word="threes">threes</span>, <span word="with">with</span> <span word="multiple">multiple</span> <span word="male">male</span> <span word="and">and</span> <span word="female">female</span> <span word="reproductive">reproductive</span> <span word="organs">organs</span>.</p><p><span word="Some">Some</span> <span word="questions">questions</span> <span word="about">about</span> <span word="this">this</span> <span word="species">species</span> <span word="remain">remain</span>, <span word="such">such</span> <span word="as">as</span> <span word="its">its</span> <span word="colour">colour</span> <span word="and">and</span> <span word="size">size</span>. <span word="Scientists">Scientists</span> <span word="say">say</span> <span word="a">a</span> <span word="fossil">fossil</span> <span word="of">of</span> <span word="the">the</span> <span word="bloom">bloom</span> <span word="could">could</span> <span word="help">help</span>, <span word="although">although</span> <span word="no">no</span> <span word="floral">floral</span> <span word="relics">relics</span> <span word="from">from</span> <span word="this">this</span> <span word="ancient">ancient</span> <span word="period">period</span> <span word="have">have</span> <span word="yet">yet</span> <span word="been">been</span> <span word="found">found</span>.</p><p>词汇表 <span word="traces">traces</span> <span word="back">back</span> <span word="to">to</span> 追溯到</p><p><span word="ancestral">ancestral</span> 祖先的</p><p><span word="evolutionary">evolutionary</span> 进化上的 </p><p><span word="changed">changed</span> <span word="over">over</span> <span word="time">time</span> 随着时间改变了</p>
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