In all, the study included 41 archaeological sites on five continents. The researchers found that, as humans migrated out of Africa, they left a trail of dead elephants and mammoths in their wake.

他们对5大洲41处考古地点进行研究，结果发现，人类走出非洲的途中，身后一路留下大象和猛犸象的遗骸。

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An experimental study is performed on the measuring characteristics of BOTDR for structural health monitoring, including dead weight tension test and optical fiber compression-tension test.

应用BOTDR检测技术对用于结构物健康监测的光纤变形检出特性进行了试验研究，包括光纤锥重拉伸试验和光纤压缩与拉张试验。

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Nancy Rabalais, executive director of the Louisiana Universities Marine Consortium and an expert on dead zones who didn't participate in the study, said its findings are consistent with climate change scenarios she projects for the upper Mississippi River basin, where flooding caused high algae concentrations two years ago.

NPR: Report Predicts Ever-Bigger Lake Erie Algae Blooms