一次失败的实验
<p>最近这几天，我们学校的走廊上全都是在津津有味地用放大镜来取火的人。有的烧了白纸，有的烧了树叶，有的甚至烧了铅笔。刚好今天是星期六，我也想做做这个实验。</p><p><span word="In">In</span> <span word="recent">recent</span> <span word="days">days</span>, <span word="the">the</span> <span word="corridor">corridor</span> <span word="of">of</span> <span word="our">our</span> <span word="school">school</span> <span word="is">is</span> <span word="full">full</span> <span word="of">of</span> <span word="people">people</span> <span word="who">who</span> <span word="are">are</span> <span word="using">using</span> <span word="magnifying">magnifying</span> <span word="glass">glass</span> <span word="to">to</span> <span word="get">get</span> <span word="fire">fire</span> <span word="with">with</span> <span word="relish">relish</span>. <span word="Some">Some</span> <span word="burn">burn</span> <span word="white">white</span> <span word="paper">paper</span>, <span word="some">some</span> <span word="burn">burn</span> <span word="leaves">leaves</span>, <span word="some">some</span> <span word="even">even</span> <span word="burn">burn</span> <span word="pencils">pencils</span>. <span word="It">It</span>'<span word="s">s</span> <span word="Saturday">Saturday</span>. <span word="I">I</span> <span word="want">want</span> <span word="to">to</span> <span word="do">do</span> <span word="the">the</span> <span word="experiment">experiment</span>.</p><p>早上太阳出来了，我带着放大镜和纸下楼。我用放大镜对准太阳，再在下面垫上一张纸，纸上出现一个大圆圈。我把放大镜左右上下移动，终于出现了一个光亮的小圆点。我坐在那里一动不动，可是过了好久纸也没烧着，于是我就想：可能现在的太阳还不猛烈，中午再来吧！</p><p><span word="In">In</span> <span word="the">the</span> <span word="morning">morning</span>, <span word="when">when</span> <span word="the">the</span> <span word="sun">sun</span> <span word="came">came</span> <span word="out">out</span>, <span word="I">I</span> <span word="went">went</span> <span word="downstairs">downstairs</span> <span word="with">with</span> <span word="a">a</span> <span word="magnifying">magnifying</span> <span word="glass">glass</span> <span word="and">and</span> <span word="paper">paper</span>. <span word="I">I</span> <span word="used">used</span> <span word="a">a</span> <span word="magnifying">magnifying</span> <span word="glass">glass</span> <span word="to">to</span> <span word="aim">aim</span> <span word="at">at</span> <span word="the">the</span> <span word="sun">sun</span>, <span word="and">and</span> <span word="then">then</span> <span word="put">put</span> <span word="a">a</span> <span word="piece">piece</span> <span word="of">of</span> <span word="paper">paper</span> <span word="under">under</span> <span word="it">it</span>. <span word="A">A</span> <span word="big">big</span> <span word="circle">circle</span> <span word="appeared">appeared</span> <span word="on">on</span> <span word="the">the</span> <span word="paper">paper</span>. <span word="I">I</span> <span word="moved">moved</span> <span word="the">the</span> <span word="magnifying">magnifying</span> <span word="glass">glass</span> <span word="up">up</span> <span word="and">and</span> <span word="down">down</span>, <span word="and">and</span> <span word="finally">finally</span> <span word="a">a</span> <span word="small">small</span> <span word="bright">bright</span> <span word="dot">dot</span> <span word="appeared">appeared</span>. <span word="I">I</span> <span word="sat">sat</span> <span word="there">there</span> <span word="motionless">motionless</span>, <span word="but">but</span> <span word="the">the</span> <span word="paper">paper</span> <span word="didn">didn</span>'<span word="t">t</span> <span word="burn">burn</span> <span word="after">after</span> <span word="a">a</span> <span word="long">long</span> <span word="time">time</span>, <span word="so">so</span> <span word="I">I</span> <span word="thought">thought</span>: <span word="maybe">maybe</span> <span word="the">the</span> <span word="sun">sun</span> <span word="is">is</span> <span word="not">not</span> <span word="strong">strong</span> <span word="now">now</span>, <span word="come">come</span> <span word="back">back</span> <span word="at">at</span> <span word="noon">noon</span>!</p><p>到了中午，我迫不及待地跑下楼，坐在烈日下摆弄放大镜。过了一会儿，我已经满头大汗，可是纸没一点变化，还是耐心等待吧。又过了半个小时，我已经耐不住了，我摸了一下纸，一点儿也不热。我确定实验失败了，只好垂头丧气地回家了。</p>
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