调查研究表明：人类活动使雨林变得易燃
<p>研究人员说，人类活动使亚马逊雨林变得更易燃。这是由一项关于巴西亚马逊地区的研究所得出的结论之一，该结论表明即使是被保护的丛林也会受到影响。这项调查的成果已在《自然》期刊上发布。请听 <span word="Victoria">Victoria</span> <span word="Gill">Gill</span> 的报道。</p><p>(<span word="sound">sound</span>) <span word="The">The</span> <span word="sound">sound</span> <span word="of">of</span> <span word="burning">burning</span> <span word="rainforest">rainforest</span>. <span word="This">This</span> <span word="is">is</span> <span word="from">from</span> <span word="footage">footage</span> <span word="captured">captured</span> <span word="by">by</span> <span word="researchers">researchers</span> <span word="in">in</span> <span word="the">the</span> <span word="Eastern">Eastern</span> <span word="Amazon">Amazon</span>. <span word="Their">Their</span> <span word="two">two</span>-<span word="year">year</span> <span word="study">study</span> <span word="found">found</span> <span word="that">that</span> <span word="even">even</span> <span word="selective">selective</span> <span word="logging">logging</span> <span word="in">in</span> <span word="protected">protected</span> <span word="forests">forests</span> <span word="opened">opened</span> <span word="up">up</span> <span word="the">the</span> <span word="canopy">canopy</span> <span word="enough">enough</span> <span word="to">to</span> <span word="dry">dry</span> <span word="out">out</span> <span word="theundergrowth">theundergrowth</span> <span word="and">and</span> <span word="make">make</span> <span word="it">it</span> <span word="catch">catch</span> <span word="fire">fire</span> <span word="more">more</span> <span word="easily">easily</span>.</p><p><span word="To">To</span> <span word="measure">measure</span> <span word="the">the</span> <span word="impact">impact</span> <span word="of">of</span> <span word="human">human</span> <span word="activity">activity</span> <span word="on">on</span> <span word="the">the</span> <span word="rainforest">rainforest</span>, <span word="the">the</span> <span word="team">team</span> <span word="counted">counted</span> 2,000 <span word="species">species</span> <span word="of">of</span> <span word="trees">trees</span>, <span word="insects">insects</span> <span word="and">and</span> <span word="birds">birds</span>, <span word="comparing">comparing</span> <span word="biodiversity">biodiversity</span> <span word="with">with</span> <span word="the">the</span> <span word="amount">amount</span> <span word="of">of</span> <span word="forest">forest</span> <span word="cover">cover</span>, <span word="and">and</span> <span word="you">you</span> <span word="can">can</span> <span word="hear">hear</span> <span word="the">the</span> <span word="difference">difference</span>.</p><p><span word="While">While</span> <span word="a">a</span> <span word="pristine">pristine</span> <span word="undisturbed">undisturbed</span> <span word="rainforest">rainforest</span> <span word="sounds">sounds</span> <span word="like">like</span> <span word="this">this</span> (<span word="sound">sound</span>), <span word="far">far</span> <span word="fewer">fewer</span> <span word="species">species</span> <span word="contribute">contribute</span> <span word="to">to</span> <span word="the">the</span> <span word="chorus">chorus</span> <span word="when">when</span> <span word="the">the</span> <span word="forest">forest</span> <span word="is">is</span> <span word="degraded">degraded</span> (<span word="sound">sound</span>).</p><p><span word="This">This</span> <span word="large">large</span>-<span word="scale">scale</span> <span word="study">study</span> <span word="showed">showed</span> <span word="that">that</span> <span word="areas">areas</span> <span word="with">with</span> 80% <span word="forest">forest</span> <span word="cover">cover</span> <span word="lost">lost</span> <span word="up">up</span> <span word="to">to</span> <span word="half">half</span> <span word="their">their</span> <span word="biodiversity">biodiversity</span>.</p><p>词汇表</p><p><span word="footage">footage</span> 一段影片，片段</p><p><span word="selective">selective</span> <span word="logging">logging</span> 选择性伐木</p><p><span word="canopy">canopy</span> 树冠(层)</p><p><span word="undergrowth">undergrowth</span> 林下植物，指丛林下层的灌木</p><p><span word="biodiversity">biodiversity</span> 生物多样性</p><p><span word="pristine">pristine</span> 未被破坏(或砍伐)的，原始的</p>
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