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<p>我们的身边有各式各样的交通工具，如果你要旅行，你最想乘坐哪种交通工具呢你在日常生活中关察到我们用的交通工具有:空中交通工具，如飞机。陆地交通工具如公共汽车，小轿车，火车，货车等等，还有水上交通工具如轮船，潜水艇还有许多我没做过的呢</p><p><span word="We">We</span> <span word="have">have</span> <span word="all">all</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="transportation">transportation</span> <span word="around">around</span> <span word="us">us</span>. <span word="If">If</span> <span word="you">you</span> <span word="want">want</span> <span word="to">to</span> <span word="travel">travel</span>, <span word="which">which</span> <span word="kind">kind</span> <span word="of">of</span> <span word="transportation">transportation</span> <span word="do">do</span> <span word="you">you</span> <span word="want">want</span> <span word="to">to</span> <span word="take">take</span> <span word="most">most</span>? <span word="You">You</span> <span word="have">have</span> <span word="noticed">noticed</span> <span word="in">in</span> <span word="our">our</span> <span word="daily">daily</span> <span word="life">life</span> <span word="that">that</span> <span word="we">we</span> <span word="use">use</span>: <span word="air">air</span> <span word="transportation">transportation</span>, <span word="such">such</span> <span word="as">as</span> <span word="airplanes">airplanes</span>. <span word="Land">Land</span> <span word="vehicles">vehicles</span> <span word="such">such</span> <span word="as">as</span> <span word="buses">buses</span>, <span word="cars">cars</span>, <span word="trains">trains</span>, <span word="vans">vans</span> <span word="and">and</span> <span word="so">so</span> <span word="on">on</span>, <span word="as">as</span> <span word="well">well</span> <span word="as">as</span> <span word="water">water</span> <span word="vehicles">vehicles</span> <span word="such">such</span> <span word="as">as</span> <span word="ships">ships</span>, <span word="submarines">submarines</span> <span word="and">and</span> <span word="many">many</span> <span word="other">other</span> <span word="things">things</span> <span word="I">I</span> <span word="haven">haven</span>'<span word="t">t</span> <span word="done">done</span></p><p>你们知道陆地交通工具的车轮为什么是圆的呢？我们常用积木做各式各样简单的简易车，做时我们就知道圆形的车轮省力，平稳，当我们真正做到真车上时，圆形的车轮开动在前行时能保持车内的平稳，使车内的乘客做车时‘舒服，即使在爬坡时，做在车上的人或物也不会感到颠簸的不舒适而难受。你们都知道这些常识吗，希望你们也了解车子！</p><p><span word="Do">Do</span> <span word="you">you</span> <span word="know">know</span> <span word="why">why</span> <span word="the">the</span> <span word="wheels">wheels</span> <span word="of">of</span> <span word="land">land</span> <span word="vehicles">vehicles</span> <span word="are">are</span> <span word="round">round</span>? <span word="We">We</span> <span word="often">often</span> <span word="use">use</span> <span word="building">building</span> <span word="blocks">blocks</span> <span word="to">to</span> <span word="make">make</span> <span word="all">all</span> <span word="kinds">kinds</span> <span word="of">of</span> <span word="simple">simple</span> <span word="cars">cars</span>. <span word="When">When</span> <span word="we">we</span> <span word="do">do</span> <span word="it">it</span>, <span word="we">we</span> <span word="know">know</span> <span word="that">that</span> <span word="round">round</span> <span word="wheels">wheels</span> <span word="are">are</span> <span word="labor">labor</span>-<span word="saving">saving</span> <span word="and">and</span> <span word="stable">stable</span>. <span word="When">When</span> <span word="we">we</span> <span word="really">really</span> <span word="do">do</span> <span word="it">it</span> <span word="on">on</span> <span word="the">the</span> <span word="real">real</span> <span word="car">car</span>, <span word="the">the</span> <span word="round">round</span> <span word="wheels">wheels</span> <span word="can">can</span> <span word="keep">keep</span> <span word="the">the</span> <span word="stability">stability</span> <span word="of">of</span> <span word="the">the</span> <span word="car">car</span> <span word="when">when</span> <span word="moving">moving</span> <span word="forward">forward</span>, <span word="making">making</span> <span word="the">the</span> <span word="passengers">passengers</span> <span word="in">in</span> <span word="the">the</span> <span word="car">car</span> "<span word="comfortable">comfortable</span>. <span word="Even">Even</span> <span word="when">when</span> <span word="climbing">climbing</span> <span word="the">the</span> <span word="slope">slope</span>, <span word="people">people</span> <span word="or">or</span> <span word="things">things</span> <span word="in">in</span> <span word="the">the</span> <span word="car">car</span> <span word="will">will</span> <span word="not">not</span> <span word="feel">feel</span> <span word="uncomfortable">uncomfortable</span> <span word="and">and</span> <span word="uncomfortable">uncomfortable</span>. <span word="Do">Do</span> <span word="you">you</span> <span word="all">all</span> <span word="know">know</span> <span word="these">these</span> <span word="common">common</span> <span word="sense">sense</span>? <span word="I">I</span> <span word="hope">hope</span> <span word="you">you</span> <span word="also">also</span> <span word="know">know</span> <span word="about">about</span> <span word="cars">cars</span>!</p>
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