典型文献
The Unseen Marine Animals Killer-1
文献摘要：
In the aftermath of the terrorist attacks on 11 Septem b er 2001, a great lull fell over North America, a b ove and b elow the water. Understanda b ly, fewer people were traveling b y air. But ship traffic was also significantly reduced, even as far north as the Bay of Fundy in Canada. As a result, underwater noise in the b ay dropped b y an incredi b le six deci b els, and sounds at pitches b elow 150 Hz were significantly reduced. The area is frequented b y North Atlantic right whales, so scientists at Duke University decided to see if the quieter waters had any impact on the giant mammals. Sure enough, after analysing their faecal matter for stress hormones, they found the lower human-caused ocean noise was leading to lower stress levels.
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引用格式：
[1]-.The Unseen Marine Animals Killer-1)[J].数理天地（高中版）,2022(17):97-98
A类：
terrorist,Septem,lull,ove,elow,Understanda,Fundy,incredi,frequented
B类：
Unseen,Marine,Animals,Killer,In,aftermath,attacks,great,fell,over,North,America,fewer,people,were,traveling,air,But,ship,traffic,was,also,significantly,reduced,even,far,north,Bay,Canada,result,underwater,noise,dropped,six,sounds,pitches,area,Atlantic,right,whales,scientists,Duke,University,decided,quieter,waters,had,any,impact,giant,mammals,Sure,enough,analysing,their,faecal,matter,stress,hormones,they,found,lower,human,caused,ocean,leading,levels
AB值：
0.577868
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机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
