我的理想
<p>我们天天都要和称打交道，买东西要用称称。称分别有手称、台称、大到电子称，小到天秤。电子称能称上百吨的东西，但在古时没有很大的称时，要称很重的东西毫无办法了，可是三国时，曹操的儿子曹冲，小小年纪，能想出办法称出大象的重量，难能可贵，他的聪明才智，一直在人民心中流传千古。可是有谁见过能称地球的“怪人”吗？确有其人，请看《小学生之友》称地球的“怪人”。</p><p><span word="We">We</span> <span word="have">have</span> <span word="to">to</span> <span word="deal">deal</span> <span word="with">with</span> <span word="scales">scales</span> <span word="every">every</span> <span word="day">day</span>. <span word="We">We</span> <span word="need">need</span> <span word="to">to</span> <span word="use">use</span> <span word="scales">scales</span> <span word="when">when</span> <span word="shopping">shopping</span>. <span word="The">The</span> <span word="scales">scales</span> <span word="are">are</span> <span word="hand">hand</span> <span word="scale">scale</span>, <span word="platform">platform</span> <span word="scale">scale</span>, <span word="electronic">electronic</span> <span word="scale">scale</span> <span word="and">and</span> <span word="Libra">Libra</span> <span word="scale">scale</span>. <span word="The">The</span> <span word="electronic">electronic</span> <span word="scale">scale</span> <span word="can">can</span> <span word="weigh">weigh</span> <span word="hundreds">hundreds</span> <span word="of">of</span> <span word="tons">tons</span> <span word="of">of</span> <span word="things">things</span>, <span word="but">but</span> <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="way">way</span> <span word="to">to</span> <span word="weigh">weigh</span> <span word="heavy">heavy</span> <span word="things">things</span> <span word="when">when</span> <span word="there">there</span> <span word="is">is</span> <span word="no">no</span> <span word="big">big</span> <span word="scale">scale</span> <span word="in">in</span> <span word="ancient">ancient</span> <span word="times">times</span>. <span word="But">But</span> <span word="in">in</span> <span word="the">the</span> <span word="Three">Three</span> <span word="Kingdoms">Kingdoms</span>, <span word="Cao">Cao</span> <span word="Chong">Chong</span>, <span word="Cao">Cao</span> <span word="Cao">Cao</span>'<span word="s">s</span> <span word="son">son</span>, <span word="was">was</span> <span word="young">young</span> <span word="and">and</span> <span word="could">could</span> <span word="figure">figure</span> <span word="out">out</span> <span word="a">a</span> <span word="way">way</span> <span word="to">to</span> <span word="weigh">weigh</span> <span word="the">the</span> <span word="elephant">elephant</span>. <span word="His">His</span> <span word="intelligence">intelligence</span> <span word="and">and</span> <span word="wisdom">wisdom</span> <span word="have">have</span> <span word="been">been</span> <span word="flowing">flowing</span> <span word="through">through</span> <span word="the">the</span> <span word="hearts">hearts</span> <span word="of">of</span> <span word="the">the</span> <span word="people">people</span> <span word="for">for</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="years">years</span>. <span word="But">But</span> <span word="has">has</span> <span word="anyone">anyone</span> <span word="ever">ever</span> <span word="seen">seen</span> <span word="a">a</span> "<span word="freak">freak</span>" <span word="who">who</span> <span word="can">can</span> <span word="call">call</span> <span word="the">the</span> <span word="earth">earth</span>? <span word="It">It</span>'<span word="s">s</span> <span word="a">a</span> <span word="real">real</span> <span word="person">person</span>. <span word="Please">Please</span> <span word="see">see</span> <span word="what">what</span> <span word="friends">friends</span> <span word="of">of</span> <span word="primary">primary</span> <span word="school">school</span> <span word="call">call</span> <span word="the">the</span> "<span word="strange">strange</span> <span word="person">person</span>" <span word="of">of</span> <span word="the">the</span> <span word="earth">earth</span>.</p><p>要说称地球的怪人是英国着名的物理学家卡文迪许，他利用一根木棍和两个像哑铃的铅球，再用石英丝把两个铅球横吊起来，在地球的引力作用下，铅球发生摆动，石英丝扭动就能计算出地球的质量，在实验中由于铅球的引力太微弱，实验失败而告终。但卡文迪许在困难面前并没放弃，他像牛顿、爱迪生一样选择了坚强，他没灰心丧气，只知道研究苦苦思索，观察事物。他在走路时，偶然发现一个小孩在路边玩镜子，那太阳光影反射启发了他，他迫不及待在实验室里夜以继日开始长达50多年的实验，功夫不负有心人，终于在1798年按照万有引力的公式计算出地球的重量为60万亿亿吨。为称地球他由一个英俊的青年小伙子变成了一个白发苍苍的老年人。他为了真理，为了创造，为了科学研究，花了人生青春年华也在所不计。</p>
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