考研作文的背诵2
<p> <span word="Bats">Bats</span>蝙蝠</p><p> <span word="In">In</span> <span word="what">what</span> <span word="way">way</span> <span word="does">does</span> <span word="echo">echo</span>-<span word="location">location</span> <span word="in">in</span> <span word="bats">bats</span> <span word="play">play</span> <span word="an">an</span> <span word="utilitarian">utilitarian</span> <span word="role">role</span>?</p><p> <span word="Not">Not</span> <span word="all">all</span> <span word="sounds">sounds</span> <span word="made">made</span> <span word="by">by</span> <span word="animals">animals</span> <span word="serve">serve</span> <span word="as">as</span> <span word="language">language</span>, <span word="and">and</span> <span word="we">we</span> <span word="have">have</span> <span word="only">only</span> <span word="to">to</span> <span word="turn">turn</span> <span word="to">to</span> <span word="that">that</span> <span word="extraordinary">extraordinary</span> <span word="discovery">discovery</span> <span word="of">of</span> <span word="echo">echo</span>-<span word="location">location</span> <span word="in">in</span> <span word="bats">bats</span> <span word="to">to</span> <span word="see">see</span> <span word="a">a</span> <span word="case">case</span> <span word="in">in</span> <span word="which">which</span> <span word="the">the</span> <span word="voice">voice</span> <span word="plays">plays</span> <span word="a">a</span> <span word="strictly">strictly</span> <span word="utilitarian">utilitarian</span> <span word="role">role</span>.</p><p> <span word="To">To</span> <span word="get">get</span> <span word="a">a</span> <span word="full">full</span> <span word="appreciation">appreciation</span> <span word="of">of</span> <span word="what">what</span> <span word="this">this</span> <span word="means">means</span> <span word="we">we</span> <span word="must">must</span> <span word="turn">turn</span> <span word="first">first</span> <span word="to">to</span> <span word="some">some</span> <span word="recent">recent</span> <span word="human">human</span> <span word="inventions">inventions</span>. <span word="Everyone">Everyone</span> <span word="knows">knows</span> <span word="that">that</span> <span word="if">if</span> <span word="he">he</span> <span word="shouts">shouts</span> <span word="in">in</span> <span word="the">the</span> <span word="vicinity">vicinity</span> <span word="of">of</span> <span word="a">a</span> <span word="wall">wall</span> <span word="or">or</span> <span word="a">a</span> <span word="mountainside">mountainside</span>, <span word="an">an</span> <span word="echo">echo</span> <span word="will">will</span> <span word="come">come</span> <span word="back">back</span>. <span word="The">The</span> <span word="further">further</span> <span word="off">off</span> <span word="this">this</span> <span word="solid">solid</span> <span word="obstruction">obstruction</span>, <span word="the">the</span> <span word="longer">longer</span> <span word="time">time</span> <span word="will">will</span> <span word="elapse">elapse</span> <span word="for">for</span> <span word="the">the</span> <span word="return">return</span> <span word="of">of</span> <span word="the">the</span> <span word="echo">echo</span>. <span word="A">A</span> <span word="sound">sound</span> <span word="made">made</span> <span word="by">by</span> <span word="tapping">tapping</span> <span word="on">on</span> <span word="the">the</span> <span word="hull">hull</span> <span word="of">of</span> <span word="a">a</span> <span word="ship">ship</span> <span word="will">will</span> <span word="be">be</span> <span word="reflected">reflected</span> <span word="from">from</span> <span word="the">the</span> <span word="sea">sea</span> <span word="bottom">bottom</span>, <span word="and">and</span> <span word="by">by</span> <span word="measuring">measuring</span> <span word="the">the</span> <span word="time">time</span> <span word="interval">interval</span> <span word="between">between</span> <span word="the">the</span> <span word="taps">taps</span> <span word="and">and</span> <span word="the">the</span> <span word="receipt">receipt</span> <span word="of">of</span> <span word="the">the</span> <span word="echoes">echoes</span>, <span word="the">the</span> <span word="depth">depth</span> <span word="of">of</span> <span word="the">the</span> <span word="sea">sea</span> <span word="at">at</span> <span word="that">that</span> <span word="point">point</span> <span word="can">can</span> <span word="be">be</span> <span word="calculated">calculated</span>. <span word="So">So</span> <span word="was">was</span> <span word="born">born</span> <span word="the">the</span> <span word="echo">echo</span>-<span word="sounding">sounding</span> <span word="apparatus">apparatus</span>, <span word="now">now</span> <span word="in">in</span> <span word="general">general</span> <span word="use">use</span> <span word="in">in</span> <span word="ships">ships</span>. <span word="Every">Every</span> <span word="solid">solid</span> <span word="object">object</span> <span word="will">will</span> <span word="reflect">reflect</span> <span word="a">a</span> <span word="sound">sound</span>, <span word="varying">varying</span> <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="size">size</span> <span word="and">and</span> <span word="nature">nature</span> <span word="of">of</span> <span word="the">the</span> <span word="object">object</span>. <span word="A">A</span> <span word="shoal">shoal</span> <span word="of">of</span> <span word="fish">fish</span> <span word="will">will</span> <span word="do">do</span> <span word="this">this</span>. <span word="So">So</span> <span word="it">it</span> <span word="is">is</span> <span word="a">a</span> <span word="comparatively">comparatively</span> <span word="simple">simple</span> <span word="step">step</span> <span word="from">from</span> <span word="locating">locating</span> <span word="the">the</span> <span word="sea">sea</span> <span word="bottom">bottom</span> <span word="to">to</span> <span word="locating">locating</span> <span word="a">a</span> <span word="shoal">shoal</span> <span word="of">of</span> <span word="fish">fish</span>. <span word="With">With</span> <span word="experience">experience</span>, <span word="and">and</span> <span word="with">with</span> <span word="improved">improved</span> <span word="apparatus">apparatus</span>, <span word="it">it</span> <span word="is">is</span> <span word="now">now</span> <span word="possible">possible</span> <span word="not">not</span> <span word="only">only</span> <span word="to">to</span> <span word="locate">locate</span> <span word="a">a</span> <span word="shoal">shoal</span> <span word="but">but</span> <span word="to">to</span> <span word="tell">tell</span> <span word="if">if</span> <span word="it">it</span> <span word="is">is</span> <span word="herring">herring</span>, <span word="cod">cod</span>, <span word="or">or</span> <span word="other">other</span> <span word="well">well</span>-<span word="known">known</span> <span word="fish">fish</span>, <span word="by">by</span> <span word="the">the</span> <span word="pattern">pattern</span> <span word="of">of</span> <span word="its">its</span> <span word="echo">echo</span>.</p><p> <span word="It">It</span> <span word="has">has</span> <span word="been">been</span> <span word="found">found</span> <span word="that">that</span> <span word="certain">certain</span> <span word="bats">bats</span> <span word="emit">emit</span> <span word="squeaks">squeaks</span> <span word="and">and</span> <span word="by">by</span> <span word="receiving">receiving</span> <span word="the">the</span> <span word="echoes">echoes</span>, <span word="they">they</span> <span word="can">can</span> <span word="locate">locate</span> <span word="and">and</span> <span word="steer">steer</span> <span word="clear">clear</span> <span word="of">of</span> <span word="obstacles">obstacles</span> -- <span word="or">or</span> <span word="locate">locate</span> <span word="flying">flying</span> <span word="insects">insects</span> <span word="on">on</span> <span word="which">which</span> <span word="they">they</span> <span word="feed">feed</span>. <span word="This">This</span> <span word="echo">echo</span>-<span word="location">location</span> <span word="in">in</span> <span word="bats">bats</span> <span word="is">is</span> <span word="often">often</span> <span word="compared">compared</span> <span word="with">with</span> <span word="radar">radar</span>, <span word="the">the</span> <span word="principle">principle</span> <span word="of">of</span> <span word="which">which</span> <span word="is">is</span> <span word="similar">similar</span>.</p>
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