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Theybelievethatthesteepdeclineinpopulationsofmanyanimalspecies还有extinctoutofastartingtotalof5,570species怎么理解啊Thatwouldrequiredealingwithaperfectstormofthreats请英语高手帮忙解释下单个词我知道

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They believe that the steep decline in populations of many animal species还有
extinct out of a starting total of 5,570 species怎么理解啊That would require dealing with a perfect storm of threats请英语高手帮忙解释下单个词我知道什么意思整个句子就没法理解了学英语都会这样吗

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They believe that the steep decline in populations of many animal species...他们相信众多物种的数量(人口)之所以急剧下降.extinct out of a starting total of 5,570 species由最初总数的5,570个物种开始减少 (...