外来物种入侵
<p>近日，在福州召开的生物入侵国际大会上，中国农业部官员表示，我国已成为遭受生物入侵最严重的国家之一，不仅造成了巨额经济损失，还导致了生态环境的严重破坏，生态退化和生物多样性丧失，引起土著物种尤其是珍稀濒危物种的消失和灭绝。</p><p><span word="China">China</span> <span word="is">is</span> <span word="threatened">threatened</span> <span word="by">by</span> <span word="more">more</span> <span word="than">than</span> 400 <span word="invasive">invasive</span> <span word="alien">alien</span> <span word="species">species</span>, <span word="which">which</span> <span word="has">has</span> <span word="caused">caused</span> <span word="billions">billions</span> <span word="of">of</span> <span word="yuan">yuan</span> <span word="of">of</span> <span word="economic">economic</span> <span word="losses">losses</span>, <span word="an">an</span> <span word="agricultural">agricultural</span> <span word="official">official</span> <span word="said">said</span> <span word="Monday">Monday</span>.</p><p>农业部一位官员本周一称，中国正受到超过400种入侵的外来物种的威胁，每年给中国造成的经济损失高达数十亿元。</p><p>文中的<span word="alien">alien</span> <span word="species">species</span>就是指“外来物种”，也就是<span word="non">non</span>-<span word="indigenous">indigenous</span>/<span word="non">non</span>-<span word="native">native</span> <span word="species">species</span>(非本土物种，外源种)。由于<span word="alien">alien</span> <span word="species">species</span>进入<span word="ecology">ecology</span> <span word="system">system</span>(生态系统)之后，缺乏自然控制机制，往往会迅速繁殖，威胁<span word="ecological">ecological</span> <span word="safety">safety</span>(生态安全)。例如澳大利亚的“兔灾”、地中海的“毒藻”、夏威夷的“蛙声”等等。当然，<span word="alien">alien</span> <span word="species">species</span>如果引进得当，也会增加当地的<span word="bio">bio</span>-<span word="resource">resource</span> <span word="diversity">diversity</span>(生物资源多样性)。</p><p><span word="Alien">Alien</span>在这里表示“外国的、异域的”。例如我有一位<span word="alien">alien</span> <span word="friend">friend</span>(外国朋友)，他是位<span word="resident">resident</span> <span word="alien">alien</span>(外籍居民)，在一家<span word="alien">alien</span> <span word="corporation">corporation</span>(外国公司)工作。<span word="His">His</span> <span word="ideas">ideas</span> <span word="are">are</span> <span word="quite">quite</span> <span word="alien">alien</span> <span word="to">to</span> <span word="our">our</span> <span word="own">own</span>.(他的想法跟我们的截然不同。)他总说自己见过<span word="alien">alien</span>(外星人)，我们都很怀疑，但<span word="Lying">Lying</span> <span word="is">is</span> <span word="alien">alien</span> <span word="to">to</span> <span word="his">his</span> <span word="nature">nature</span>(他生性不喜欢撒谎)，我们也只好将信将疑。</p>
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