Butterfly numbers drop a mystery, say experts 英国蝴蝶数量下降现象令专家费解
<p><span word="Butterfly">Butterfly</span> <span word="numbers">numbers</span> <span word="drop">drop</span> <span word="a">a</span> <span word="mystery">mystery</span>, <span word="say">say</span> <span word="experts">experts</span> 英国蝴蝶数量下降现象令专家费解</p><p><span word="Play">Play</span> <span word="audio">audio</span> <span word="file">file</span> 英国的蝴蝶数目大量减少，这让野生动植物专家们感到非常费解。一项由成千上万名志愿者参与的年度“蝶口统计”调查显示，与 2013 年每计数次的 23 只相比，今年的平均值降到了 12.2 。此前，蝴蝶数目曾在 2017 年潮湿的夏天骤然下降，本年度的数量甚至比当时还要少。推行这个计划的蝴蝶保护协会（ <span word="Butterfly">Butterfly</span> <span word="Conservation">Conservation</span> ）说，造成该现象的原因至今仍是一个谜。请听报道。</p><p><span word="Each">Each</span> <span word="year">year</span>, <span word="tens">tens</span> <span word="of">of</span> <span word="thousands">thousands</span> <span word="of">of</span> <span word="people">people</span> <span word="take">take</span> <span word="part">part</span> <span word="in">in</span> <span word="The">The</span> <span word="Big">Big</span> <span word="Butterfly">Butterfly</span> <span word="Count">Count</span> <span word="to">to</span> <span word="help">help</span> <span word="experts">experts</span> <span word="chart">chart</span> <span word="the">the</span> <span word="fortunes">fortunes</span> <span word="of">of</span> <span word="common">common</span> <span word="species">species</span>.</p><p><span word="Some">Some</span> <span word="butterflies">butterflies</span> <span word="recorded">recorded</span> <span word="their">their</span> <span word="worst">worst</span> <span word="numbers">numbers</span> <span word="since">since</span> <span word="the">the</span> <span word="project">project</span> <span word="began">began</span> <span word="in">in</span> 2010. <span word="Sightings">Sightings</span> <span word="of">of</span> <span word="commas">commas</span> <span word="were">were</span> <span word="down">down</span> 46% <span word="compared">compared</span> <span word="with">with</span> <span word="last">last</span> <span word="year">year</span>.</p><p><span word="Butterfly">Butterfly</span> <span word="Conservation">Conservation</span> <span word="says">says</span> <span word="the">the</span> <span word="weather">weather</span> <span word="this">this</span> <span word="summer">summer</span> <span word="should">should</span> <span word="have">have</span> <span word="helped">helped</span> <span word="the">the</span> <span word="insects">insects</span>. <span word="It">It</span> <span word="thinks">thinks</span> <span word="the">the</span> <span word="mild">mild</span> <span word="winter">winter</span> <span word="and">and</span> <span word="cold">cold</span> <span word="spring">spring</span> <span word="could">could</span> <span word="have">have</span> <span word="had">had</span> <span word="an">an</span> <span word="effect">effect</span> <span word="along">along</span> <span word="with">with</span> <span word="pesticides">pesticides</span>. <span word="But">But</span> <span word="there">there</span> <span word="were">were</span> <span word="some">some</span> <span word="successes">successes</span> – <span word="red">red</span> <span word="admirals">admirals</span> <span word="were">were</span> <span word="up">up</span> 70% <span word="on">on</span> <span word="last">last</span> <span word="year">year</span>, <span word="and">and</span> <span word="green">green</span>-<span word="veined">veined</span> <span word="whites">whites</span> <span word="were">were</span> <span word="up">up</span> 58%.</p><p>词汇表 <span word="The">The</span> <span word="Big">Big</span> <span word="Butterfly">Butterfly</span> <span word="Count">Count</span> 由英国蝴蝶保护协会推行的“蝶口统计”项目，号召全国志愿者记录并统计不同种类的蝴蝶数量</p><p><span word="chart">chart</span> 标示，详细记录</p><p><span word="fortunes">fortunes</span> 时运</p><p><span word="numbers">numbers</span> 数目，数量</p>
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