纸船中的小奥秘
<p>个风和日丽的下午，我正在洗手，洗着，洗着，竞不知不觉地玩起水来。这时，我的脑海中忽然闪现出一个念头，如果我折一条小纸船放在水里，它会不会沉下去呢？</p><p><span word="One">One</span> <span word="sunny">sunny</span> <span word="afternoon">afternoon</span>, <span word="I">I</span> <span word="was">was</span> <span word="washing">washing</span> <span word="my">my</span> <span word="hands">hands</span>, <span word="washing">washing</span>, <span word="washing">washing</span>, <span word="competing">competing</span> <span word="unconsciously">unconsciously</span> <span word="to">to</span> <span word="play">play</span> <span word="with">with</span> <span word="water">water</span>. <span word="At">At</span> <span word="this">this</span> <span word="time">time</span>, <span word="a">a</span> <span word="thought">thought</span> <span word="suddenly">suddenly</span> <span word="flashed">flashed</span> <span word="in">in</span> <span word="my">my</span> <span word="mind">mind</span>, <span word="if">if</span> <span word="I">I</span> <span word="fold">fold</span> <span word="a">a</span> <span word="small">small</span> <span word="paper">paper</span> <span word="boat">boat</span> <span word="and">and</span> <span word="put">put</span> <span word="it">it</span> <span word="in">in</span> <span word="the">the</span> <span word="water">water</span>, <span word="will">will</span> <span word="it">it</span> <span word="sink">sink</span>?</p><p>说干就干，于是我立刻兴致勃勃地折了一条纸船放在水里，纸船竞然没有沉下去。我转念一想：“如果给它增加一些阻力，那会沉下去吗？想到这，我立即行动起来，首先我对着小船用嘴使劲地吹风，并拼命地拍打水面，最后还用手按住小船往水里压，小船沉下去但又马上浮上来了。不论怎样，它始终浮在水面上。霎时间，我的心里涌出了无数个问号，急忙跑去问妈妈：“为什么小船不会沉下去？我还对着它吹风，起浪，甚至还用手去按它，可它还是不会沉下去？”</p><p><span word="Said">Said</span> <span word="to">to</span> <span word="do">do</span>, <span word="so">so</span> <span word="I">I</span> <span word="immediately">immediately</span> <span word="happily">happily</span> <span word="folded">folded</span> <span word="a">a</span> <span word="paper">paper</span> <span word="boat">boat</span> <span word="and">and</span> <span word="put">put</span> <span word="it">it</span> <span word="in">in</span> <span word="the">the</span> <span word="water">water</span>, <span word="but">but</span> <span word="the">the</span> <span word="paper">paper</span> <span word="boat">boat</span> <span word="did">did</span> <span word="not">not</span> <span word="sink">sink</span>. <span word="I">I</span> <span word="turned">turned</span> <span word="to">to</span> <span word="think">think</span>: "<span word="if">if</span> <span word="you">you</span> <span word="add">add</span> <span word="some">some</span> <span word="resistance">resistance</span> <span word="to">to</span> <span word="it">it</span>, <span word="will">will</span> <span word="it">it</span> <span word="sink">sink</span>?"? <span word="Thinking">Thinking</span> <span word="of">of</span> <span word="this">this</span>, <span word="I">I</span> <span word="immediately">immediately</span> <span word="started">started</span> <span word="to">to</span> <span word="act">act</span>. <span word="First">First</span>, <span word="I">I</span> <span word="blew">blew</span> <span word="hard">hard</span> <span word="at">at</span> <span word="the">the</span> <span word="boat">boat</span> <span word="with">with</span> <span word="my">my</span> <span word="mouth">mouth</span>, <span word="and">and</span> <span word="beat">beat</span> <span word="the">the</span> <span word="water">water</span> <span word="desperately">desperately</span>. <span word="Finally">Finally</span>, <span word="I">I</span> <span word="pressed">pressed</span> <span word="the">the</span> <span word="boat">boat</span> <span word="into">into</span> <span word="the">the</span> <span word="water">water</span> <span word="with">with</span> <span word="my">my</span> <span word="hand">hand</span>, <span word="and">and</span> <span word="the">the</span> <span word="boat">boat</span> <span word="sank">sank</span> <span word="but">but</span> <span word="immediately">immediately</span> <span word="came">came</span> <span word="up">up</span>. <span word="Anyway">Anyway</span>, <span word="it">it</span> <span word="always">always</span> <span word="floats">floats</span> <span word="on">on</span> <span word="the">the</span> <span word="water">water</span>. <span word="All">All</span> <span word="of">of</span> <span word="a">a</span> <span word="sudden">sudden</span>, <span word="my">my</span> <span word="heart">heart</span> <span word="gushed">gushed</span> <span word="out">out</span> <span word="countless">countless</span> <span word="question">question</span> <span word="marks">marks</span>, <span word="hurriedly">hurriedly</span> <span word="ran">ran</span> <span word="to">to</span> <span word="ask">ask</span> <span word="my">my</span> <span word="mother">mother</span>, "<span word="why">why</span> <span word="can">can</span>'<span word="t">t</span> <span word="the">the</span> <span word="boat">boat</span> <span word="sink">sink</span>?"? <span word="I">I</span> <span word="still">still</span> <span word="blow">blow</span> <span word="and">and</span> <span word="wave">wave</span> <span word="at">at</span> <span word="it">it</span>, <span word="and">and</span> <span word="even">even</span> <span word="press">press</span> <span word="it">it</span> <span word="with">with</span> <span word="my">my</span> <span word="hand">hand</span>, <span word="but">but</span> <span word="it">it</span> <span word="will">will</span> <span word="not">not</span> <span word="sink">sink</span>? 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