Mysteries of elephant sleep revealed 科学家揭开大象的睡眠模式之谜
<p>媒体英语 <span word="Mysteries">Mysteries</span> <span word="of">of</span> <span word="elephant">elephant</span> <span word="sleep">sleep</span> <span word="revealed">revealed</span> 科学家揭开大象的睡眠模式之谜 </p><p><span word="Play">Play</span> <span word="audio">audio</span> <span word="file">file</span> 文字稿 一项研究表明，非洲野象是睡眠时间最短的哺乳动物。一组科学家在非洲南部国家博茨瓦纳追踪记录了两只大象在自然环境中的睡眠规律。在动物园中笼养的大象每天睡四到六个小时，然而生活在野外的大象只休息两个小时，大多在夜晚入睡。请听 <span word="Helen">Helen</span> <span word="Briggs">Briggs</span> 的报道。</p><p><span word="Scientists">Scientists</span> <span word="tracked">tracked</span> <span word="two">two</span> <span word="elephants">elephants</span> <span word="roaming">roaming</span> <span word="across">across</span> <span word="Botswana">Botswana</span> <span word="to">to</span> <span word="find">find</span> <span word="out">out</span> <span word="more">more</span> <span word="about">about</span> <span word="the">the</span> <span word="animals">animals</span>' <span word="sleeping">sleeping</span> <span word="habits">habits</span>. <span word="Elephants">Elephants</span> <span word="in">in</span> <span word="captivity">captivity</span> <span word="sleep">sleep</span> <span word="for">for</span> <span word="four">four</span> <span word="to">to</span> <span word="six">six</span> <span word="hours">hours</span> <span word="a">a</span> <span word="day">day</span>, <span word="but">but</span> <span word="it">it</span>'<span word="s">s</span> <span word="always">always</span> <span word="been">been</span> <span word="suspected">suspected</span> <span word="this">this</span> <span word="might">might</span> <span word="be">be</span> <span word="different">different</span> <span word="in">in</span> <span word="the">the</span> <span word="wild">wild</span>.</p><p><span word="In">In</span> <span word="fact">fact</span>, <span word="in">in</span> <span word="their">their</span> <span word="natural">natural</span> <span word="surroundings">surroundings</span>, <span word="the">the</span> <span word="elephants">elephants</span> <span word="slept">slept</span> <span word="for">for</span> <span word="only">only</span> <span word="two">two</span> <span word="hours">hours</span>, <span word="mainly">mainly</span> <span word="at">at</span> <span word="night">night</span>. <span word="The">The</span> <span word="elephants">elephants</span>, <span word="both">both</span> <span word="matriarchs">matriarchs</span> <span word="of">of</span> <span word="the">the</span> <span word="herd">herd</span>, <span word="sometimes">sometimes</span> <span word="stayed">stayed</span> <span word="awake">awake</span> <span word="for">for</span> <span word="days">days</span> <span word="at">at</span> <span word="a">a</span> <span word="time">time</span>, <span word="and">and</span> <span word="they">they</span> <span word="travelled">travelled</span> <span word="long">long</span> <span word="distances">distances</span>, <span word="perhaps">perhaps</span> <span word="to">to</span> <span word="escape">escape</span> <span word="lions">lions</span> <span word="or">or</span> <span word="poachers">poachers</span>. <span word="And">And</span> <span word="they">they</span> <span word="only">only</span> <span word="went">went</span> <span word="into">into</span> <span word="rapid">rapid</span> <span word="eye">eye</span> <span word="movement">movement</span> <span word="or">or</span> '<span word="dreaming">dreaming</span> <span word="sleep">sleep</span>' <span word="every">every</span> <span word="three">three</span> <span word="or">or</span> <span word="four">four</span> <span word="days">days</span>.</p><p><span word="Sleep">Sleep</span> <span word="plays">plays</span> <span word="a">a</span> <span word="big">big</span> <span word="role">role</span> <span word="in">in</span> <span word="memory">memory</span>. <span word="It">It</span>'<span word="s">s</span> <span word="a">a</span> <span word="mystery">mystery</span> <span word="why">why</span> <span word="an">an</span> <span word="animal">animal</span> <span word="known">known</span> <span word="for">for</span> <span word="its">its</span> <span word="incredible">incredible</span> <span word="memory">memory</span> <span word="powers">powers</span> <span word="can">can</span> <span word="survive">survive</span> <span word="on">on</span> <span word="power">power</span> <span word="naps">naps</span> <span word="alone">alone</span>.</p><p>词汇表 <span word="roaming">roaming</span> 漫步，闲逛</p><p><span word="in">in</span> <span word="captivity">captivity</span> （动物）被笼养</p><p><span word="natural">natural</span> <span word="surroundings">surroundings</span> 自然环境</p><p><span word="matriarchs">matriarchs</span> （兽群中的）母系首领</p><p><span word="herd">herd</span> 兽群，文中指象群</p>
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