美抗旱奇招：水库投
<p><span word="The">The</span> <span word="city">city</span> <span word="has">has</span> <span word="completed">completed</span> <span word="a">a</span> <span word="program">program</span> <span word="of">of</span> <span word="covering">covering</span> <span word="open">open</span>-<span word="air">air</span> <span word="reservoirs">reservoirs</span> <span word="with">with</span> <span word="floating">floating</span> "<span word="shade">shade</span> <span word="balls">balls</span>" <span word="to">to</span> <span word="protect">protect</span> <span word="water">water</span> <span word="quality">quality</span>.</p><p>为了保护水质，洛杉矶市向露天水库投放了9600万个“遮阳球”，这些球浮在水面上，水库表面已被遮盖。目前该项目已全部完成。</p><p><span word="City">City</span> <span word="officials">officials</span> <span word="this">this</span> <span word="week">week</span> <span word="dumped">dumped</span> <span word="the">the</span> <span word="last">last</span> 20,000 <span word="of">of</span> 96 <span word="million">million</span> <span word="black">black</span> <span word="balls">balls</span> <span word="into">into</span> <span word="the">the</span> <span word="Los">Los</span> <span word="Angeles">Angeles</span> <span word="Reservoir">Reservoir</span> <span word="in">in</span> <span word="Sylmar">Sylmar</span>, 25 <span word="miles">miles</span> <span word="northwest">northwest</span> <span word="of">of</span> <span word="downtown">downtown</span>. <span word="The">The</span> 4-<span word="inch">inch</span>-<span word="diameter">diameter</span> <span word="plastic">plastic</span> <span word="balls">balls</span> <span word="block">block</span> <span word="sunlight">sunlight</span> <span word="from">from</span> <span word="penetrating">penetrating</span> <span word="the">the</span> 175-<span word="acre">acre</span> <span word="surface">surface</span> <span word="of">of</span> <span word="the">the</span> <span word="reservoir">reservoir</span>.</p><p>本周，洛杉矶市官员将最后2万个黑色塑料球投放到洛杉矶水库，该水库位于西尔马，距离洛杉矶市中心西北部25英里。这些塑料球直径为4英寸，覆盖了水库175英亩<span word="That">That</span> <span word="prevents">prevents</span> <span word="chemical">chemical</span> <span word="reactions">reactions</span> <span word="that">that</span> <span word="can">can</span> <span word="cause">cause</span> <span word="algae">algae</span> <span word="blooms">blooms</span> <span word="and">and</span> <span word="other">other</span> <span word="problems">problems</span>, <span word="allowing">allowing</span> <span word="the">the</span> <span word="Department">Department</span> <span word="of">of</span> <span word="Water">Water</span> <span word="and">and</span> <span word="Power">Power</span> (<span word="DWP">DWP</span>) <span word="to">to</span> <span word="meet">meet</span> <span word="U">U</span>.<span word="S">S</span>. <span word="Environmental">Environmental</span> <span word="Protection">Protection</span> <span word="Agency">Agency</span> <span word="water">water</span>-<span word="quality">quality</span> <span word="requirements">requirements</span>.</p><p>这也可以避免发生化学反应，而化学反应可能导致水藻滋生等其它问题。此举使得洛杉矶水电局达到美国国家环境保护局的水质标准。</p><p><span word="They">They</span> <span word="have">have</span> <span word="the">the</span> <span word="added">added</span> <span word="perk">perk</span> <span word="of">of</span> <span word="aiding">aiding</span> <span word="with">with</span> <span word="the">the</span> <span word="ravages">ravages</span> <span word="of">of</span> <span word="the">the</span> <span word="drought">drought</span>, <span word="and">and</span> <span word="are">are</span> <span word="expected">expected</span> <span word="to">to</span> <span word="keep">keep</span> <span word="about">about</span> 300 <span word="million">million</span> <span word="gallons">gallons</span> <span word="annually">annually</span> <span word="from">from</span> <span word="evaporating">evaporating</span>.</p><p>此举已经缓解了干旱所带来的破坏，预计每年可以减少3亿加仑的蒸发量。</p><p>"<span word="In">In</span> <span word="the">the</span> <span word="midst">midst</span> <span word="of">of</span> <span word="California">California</span>'<span word="s">s</span> <span word="historic">historic</span> <span word="drought">drought</span>, <span word="it">it</span> <span word="takes">takes</span> <span word="bold">bold</span> <span word="ingenuity">ingenuity</span> <span word="to">to</span> <span word="maximize">maximize</span> <span word="my">my</span> <span word="goals">goals</span> <span word="for">for</span> <span word="water">water</span> <span word="conservation">conservation</span>," <span word="Mayor">Mayor</span> <span word="Eric">Eric</span> <span word="Garcetti">Garcetti</span> <span word="said">said</span> <span word="in">in</span> <span word="a">a</span> <span word="statement">statement</span>, <span word="noting">noting</span> <span word="that">that</span> <span word="the">the</span> <span word="effort">effort</span> <span word="is">is</span> "<span word="emblematic">emblematic</span> <span word="of">of</span> <span word="the">the</span> <span word="kind">kind</span> <span word="of">of</span> <span word="the">the</span> <span word="creative">creative</span> <span word="thinking">thinking</span> <span word="we">we</span> <span word="need">need</span> <span word="to">to</span> <span word="meet">meet</span> <span word="those">those</span> <span word="challenges">challenges</span>."</p>
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