珍惜水资源 要靠你我他
<p>当我第一次看到海的时候，还很小，浩瀚的大海使我惊叹，我心中自然而然地生出一个概念：水是源源不断的，是取之不尽，用之不竭的。</p><p><span word="When">When</span> <span word="I">I</span> <span word="saw">saw</span> <span word="the">the</span> <span word="sea">sea</span> <span word="for">for</span> <span word="the">the</span> <span word="first">first</span> <span word="time">time</span>, <span word="it">it</span> <span word="was">was</span> <span word="still">still</span> <span word="very">very</span> <span word="small">small</span>, <span word="and">and</span> <span word="the">the</span> <span word="vast">vast</span> <span word="sea">sea</span> <span word="amazed">amazed</span> <span word="me">me</span>. <span word="Naturally">Naturally</span>, <span word="a">a</span> <span word="concept">concept</span> <span word="came">came</span> <span word="into">into</span> <span word="being">being</span> <span word="in">in</span> <span word="my">my</span> <span word="mind">mind</span>: <span word="water">water</span> <span word="is">is</span> <span word="endless">endless</span>, <span word="inexhaustible">inexhaustible</span> <span word="and">and</span> <span word="inexhaustible">inexhaustible</span>.</p><p>的确，在人们的印象中，水无处不在，为人们的生产、生活服务。它是工业的血液，农业的命根子，生活中最不可缺少的小助手……总之，水是我们赖以生存的宝贵财富，而且据调查，我们居住的地球还有一个别名叫“水球”，顾名思义，我们的地球上70.8%充满了水。但这么多水，其中海水就占了97％，陆地上的地面水占0.017%，其中又有一半在内海和盐湖之中。淡水的根本来源是雨露，每49年落到陆地上的水只有10.5万立方米，而这其中的2/3又被植物蒸腾或地面蒸发掉，只有1/3，即3.75万立方米的水可供人类利用。</p><p><span word="Indeed">Indeed</span>, <span word="in">in</span> <span word="people">people</span>'<span word="s">s</span> <span word="impression">impression</span>, <span word="water">water</span> <span word="is">is</span> <span word="everywhere">everywhere</span>, <span word="serving">serving</span> <span word="people">people</span>'<span word="s">s</span> <span word="production">production</span> <span word="and">and</span> <span word="life">life</span>. <span word="It">It</span> <span word="is">is</span> <span word="the">the</span> <span word="blood">blood</span> <span word="of">of</span> <span word="industry">industry</span>, <span word="the">the</span> <span word="lifeblood">lifeblood</span> <span word="of">of</span> <span word="agriculture">agriculture</span>, <span word="the">the</span> <span word="most">most</span> <span word="indispensable">indispensable</span> <span word="little">little</span> <span word="assistant">assistant</span> <span word="in">in</span> <span word="life">life</span> <span word="In">In</span> <span word="a">a</span> <span word="word">word</span>, <span word="water">water</span> <span word="is">is</span> <span word="the">the</span> <span word="precious">precious</span> <span word="wealth">wealth</span> <span word="we">we</span> <span word="depend">depend</span> <span word="on">on</span> <span word="for">for</span> <span word="survival">survival</span>. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="survey">survey</span>, <span word="there">there</span> <span word="is">is</span> <span word="also">also</span> <span word="a">a</span> <span word="person">person</span> <span word="named">named</span> "<span word="water">water</span> <span word="ball">ball</span>" <span word="living">living</span> <span word="on">on</span> <span word="the">the</span> <span word="earth">earth</span>. <span word="As">As</span> <span word="the">the</span> <span word="name">name</span> <span word="suggests">suggests</span>, 70.8% <span word="of">of</span> <span word="our">our</span> <span word="earth">earth</span> <span word="is">is</span> <span word="full">full</span> <span word="of">of</span> <span word="water">water</span>. <span word="But">But</span> <span word="with">with</span> <span word="so">so</span> <span word="much">much</span> <span word="water">water</span>, 97% <span word="of">of</span> <span word="it">it</span> <span word="is">is</span> <span word="sea">sea</span> <span word="water">water</span>, 0.017% <span word="is">is</span> <span word="surface">surface</span> <span word="water">water</span> <span word="on">on</span> <span word="land">land</span>, <span word="and">and</span> <span word="half">half</span> <span word="of">of</span> <span word="it">it</span> <span word="is">is</span> <span word="in">in</span> <span word="inland">inland</span> <span word="sea">sea</span> <span word="and">and</span> <span word="salt">salt</span> <span word="lake">lake</span>. <span word="The">The</span> <span word="basic">basic</span> <span word="source">source</span> <span word="of">of</span> <span word="fresh">fresh</span> <span word="water">water</span> <span word="is">is</span> <span word="rain">rain</span> <span word="and">and</span> <span word="dew">dew</span>. <span word="Only">Only</span> 105000 <span word="cubic">cubic</span> <span word="meters">meters</span> <span word="of">of</span> <span word="water">water</span> <span word="falls">falls</span> <span word="on">on</span> <span word="the">the</span> <span word="land">land</span> <span word="every">every</span> 49 <span word="years">years</span>, <span word="and">and</span> 2 / 3 <span word="of">of</span> <span word="it">it</span> <span word="is">is</span> <span word="evaporated">evaporated</span> <span word="by">by</span> <span word="plant">plant</span> <span word="transpiration">transpiration</span> <span word="or">or</span> <span word="ground">ground</span> <span word="evaporation">evaporation</span>. <span word="Only">Only</span> 1 / 3, <span word="or">or</span> 37500 <span word="cubic">cubic</span> <span word="meters">meters</span> <span word="of">of</span> <span word="water">water</span> <span word="can">can</span> <span word="be">be</span> <span word="used">used</span> <span word="by">by</span> <span word="human">human</span> <span word="beings">beings</span>.</p>
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