They support the greatest concentrations of large animals 草原是地球上最大的
The shallow temperate seas support the greatest concentrations of fish on our planet. 这片温和的浅海是地球上鱼类最密集的地区
A bottleneck funnels these exiting bats into dense concentrations 当大群蝙蝠密集地通过瓶颈出口时
This is one of the largest concentrations of Nile crocodiles in Africa, 这里是非洲一处最大的尼罗鳄聚集地