睡觉的时候，动物们都做什么梦？
<p>"<span word="Almost">Almost</span> <span word="all">all</span> <span word="other">other</span> <span word="animals">animals</span> <span word="are">are</span> <span word="clearly">clearly</span> <span word="observed">observed</span> <span word="to">to</span> <span word="partake">partake</span> <span word="in">in</span> <span word="sleep">sleep</span>, <span word="whether">whether</span> <span word="they">they</span> <span word="are">are</span> <span word="aquatic">aquatic</span>, <span word="aerial">aerial</span>, <span word="or">or</span> <span word="terrestrial">terrestrial</span>," <span word="wrote">wrote</span> <span word="Aristotle">Aristotle</span> <span word="in">in</span> <span word="his">his</span> <span word="work">work</span> <span word="On">On</span> <span word="Sleep">Sleep</span> <span word="and">and</span> <span word="Sleeplessness">Sleeplessness</span>. <span word="But">But</span> <span word="do">do</span> <span word="other">other</span> <span word="animals">animals</span> <span word="dream">dream</span>? <span word="On">On</span> <span word="that">that</span> <span word="the">the</span> <span word="Greek">Greek</span> <span word="philosopher">philosopher</span> <span word="also">also</span> <span word="had">had</span> <span word="an">an</span> <span word="opinion">opinion</span>. <span word="In">In</span> <span word="The">The</span> <span word="History">History</span> <span word="of">of</span> <span word="Animals">Animals</span>, <span word="he">he</span> <span word="wrote">wrote</span>: "<span word="It">It</span> <span word="would">would</span> <span word="appear">appear</span> <span word="that">that</span> <span word="not">not</span> <span word="only">only</span> <span word="do">do</span> <span word="men">men</span> <span word="dream">dream</span>, <span word="but">but</span> <span word="horses">horses</span> <span word="also">also</span>, <span word="and">and</span> <span word="dogs">dogs</span>, <span word="and">and</span> <span word="oxen">oxen</span>; <span word="aye">aye</span>, <span word="and">and</span> <span word="sheep">sheep</span>, <span word="and">and</span> <span word="goats">goats</span>, <span word="and">and</span> <span word="all">all</span> <span word="viviparous">viviparous</span> <span word="quadrupeds">quadrupeds</span>; <span word="and">and</span> <span word="dogs">dogs</span> <span word="show">show</span> <span word="their">their</span> <span word="dreaming">dreaming</span> <span word="by">by</span> <span word="barking">barking</span> <span word="in">in</span> <span word="their">their</span> <span word="sleep">sleep</span>." <span word="His">His</span> <span word="research">research</span> <span word="methods">methods</span> <span word="may">may</span> <span word="lack">lack</span> <span word="sophistication">sophistication</span>, <span word="but">but</span> <span word="Aristotle">Aristotle</span> <span word="may">may</span> <span word="not">not</span> <span word="have">have</span> <span word="been">been</span> <span word="too">too</span> <span word="far">far</span> <span word="off">off</span> <span word="the">the</span> <span word="mark">mark</span>.</p><p>亚里士多德在文章《论睡和醒》中写道：“人们清楚地观察到，几乎所有的动物都会睡觉，不论是水生、陆生还是在空中飞翔的动物。”但是动物会做梦吗？在这个问题上，这个希腊哲学家也有自己的看法。在专著《动物志》中，他写道：“看来不只人会做梦，马、狗、牛也都会做梦；同样，绵羊、山羊以及所有的胎生四足动物也都会做梦；并且，狗在睡眠中吠叫就是做梦的表现。”亚里士多德的研究方法也许不够完善成熟，但和事实或许也已经相去不远了。</p><p><span word="We">We</span> <span word="certainly">certainly</span> <span word="can">can</span>'<span word="t">t</span> <span word="ask">ask</span> <span word="animals">animals</span> <span word="if">if</span> <span word="they">they</span> <span word="dream">dream</span>, <span word="but">but</span> <span word="we">we</span> <span word="can">can</span> <span word="at">at</span> <span word="least">least</span> <span word="observe">observe</span> <span word="the">the</span> <span word="evidence">evidence</span> <span word="that">that</span> <span word="they">they</span> <span word="might">might</span>. <span word="There">There</span> <span word="are">are</span> <span word="two">two</span> <span word="ways">ways</span> <span word="in">in</span> <span word="which">which</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="gone">gone</span> <span word="about">about</span> <span word="this">this</span> <span word="seemingly">seemingly</span> <span word="impossible">impossible</span> <span word="task">task</span>. <span word="One">One</span> <span word="is">is</span> <span word="to">to</span> <span word="look">look</span> <span word="at">at</span> <span word="their">their</span> <span word="physical">physical</span> <span word="behaviour">behaviour</span> <span word="during">during</span> <span word="the">the</span> <span word="various">various</span> <span word="phases">phases</span> <span word="of">of</span> <span word="the">the</span> <span word="sleep">sleep</span> <span word="cycle">cycle</span>. <span word="The">The</span> <span word="second">second</span> <span word="is">is</span> <span word="to">to</span> <span word="see">see</span> <span word="whether">whether</span> <span word="their">their</span> <span word="sleeping">sleeping</span> <span word="brains">brains</span> <span word="work">work</span> <span word="similarly">similarly</span> <span word="to">to</span> <span word="our">our</span> <span word="own">own</span> <span word="sleeping">sleeping</span> <span word="brains">brains</span>.</p>
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