2015考研英语阅读低成本雷达
<p> <span word="Low">Low</span>-<span word="cost">cost</span> <span word="radar">radar</span></p><p> 低成本雷达</p><p> <span word="A">A</span> <span word="programme">programme</span> <span word="worth">worth</span> <span word="watching">watching</span></p><p> 值得一看的节目</p><p> <span word="How">How</span> <span word="air">air</span>-<span word="traffic">traffic</span> <span word="control">control</span> <span word="can">can</span> <span word="use">use</span> <span word="television">television</span> <span word="signals">signals</span> <span word="toplot">toplot</span> <span word="aircraft">aircraft</span></p><p> 空中交通管制局如何利用电视信号找出飞行器位置?</p><p> <span word="A">A</span> <span word="NOVEL">NOVEL</span> <span word="radar">radar</span> <span word="will">will</span> <span word="soon">soon</span> <span word="be">be</span> <span word="helping">helping</span> <span word="to">to</span> <span word="keep">keep</span> <span word="an">an</span> <span word="eye">eye</span> <span word="on">on</span> <span word="aircraft">aircraft</span> <span word="flying">flying</span> <span word="over">over</span> <span word="London">London</span>.</p><p> 很快，一种新式雷达将帮忙监视伦敦上空的飞机。</p><p> <span word="Conventional">Conventional</span> <span word="radar">radar</span> <span word="uses">uses</span> <span word="a">a</span> <span word="rotating">rotating</span> <span word="antenna">antenna</span> <span word="to">to</span> <span word="sweep">sweep</span> <span word="the">the</span> <span word="sky">sky</span>, <span word="sending">sending</span> <span word="out">out</span> <span word="radio">radio</span> <span word="pulses">pulses</span> <span word="anddetecting">anddetecting</span> <span word="those">those</span> <span word="which">which</span> <span word="are">are</span> <span word="reflected">reflected</span> <span word="back">back</span> <span word="from">from</span> <span word="aircraft">aircraft</span>.</p><p> 传统雷达使用旋转天线扫视上空，不断发出射电脉冲并探测被飞行器反射回来的部分。</p><p> <span word="The">The</span> <span word="experimental">experimental</span> <span word="system">system</span> <span word="that">that</span> <span word="will">will</span> <span word="begin">begin</span> <span word="operation">operation</span> <span word="in">in</span> <span word="June">June</span> <span word="does">does</span> <span word="not">not</span> <span word="send">send</span> <span word="out">out</span> <span word="any">any</span> <span word="signals">signals</span> <span word="ofits">ofits</span> <span word="own">own</span>,</p><p> 而将于6月份启动的实验系统并不会自己发出任何信号，</p><p> <span word="but">but</span> <span word="instead">instead</span> <span word="relies">relies</span> <span word="on">on</span> <span word="a">a</span> <span word="network">network</span> <span word="ofreceivers">ofreceivers</span> <span word="to">to</span> <span word="pick">pick</span> <span word="up">up</span> <span word="television">television</span> <span word="programmes">programmes</span>.</p><p> 而是依靠一个接受电视信号的接收器网络。</p><p> <span word="It">It</span> <span word="is">is</span> <span word="hard">hard</span> <span word="to">to</span> <span word="imagine">imagine</span> <span word="British">British</span> <span word="TV">TV</span> <span word="staples">staples</span> <span word="like">like</span> <span word="Cash">Cash</span> <span word="in">in</span> <span word="the">the</span> <span word="Attic">Attic</span>, <span word="Downton">Downton</span> <span word="Abbey">Abbey</span> <span word="and">and</span> <span word="endlessrepeats">endlessrepeats</span> <span word="of">of</span> <span word="Top">Top</span> <span word="Gear">Gear</span> <span word="being">being</span> <span word="used">used</span> <span word="to">to</span> <span word="detect">detect</span> <span word="aircraft">aircraft</span>.</p><p> 很难想象像《家中藏宝》、《唐顿庄园》、《疯狂汽车秀》等这类英国的主打电视节目被用来侦查飞行器。</p>
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