wildlife populations have fallen by an average of almost 70%, 野生动物种群就已平均下降将近70%
Our ingenuity has taken us further than we could ever have imagined, 我们的聪明才智 令我们取得了过去从未设想过的成就
our story could have been a short one 但如果表现不够出色
there have been more than 50 cycles of ice buildup and melt... 已经发生50多次结冰融化的循环
They have no choice but to back down 它们别无选择 只得退下
but the hunters have him in their sights. 但猎手们已经盯上它
Age-old enemies that have been locked in battle for millennia. 数千年来 这对宿敌一直缠斗不休
and have been hunting bison in America for more than 100,000 years. 其在美洲捕杀野牛的历史 已经超过10万年
The mammals have conquered every habitat on Earth. 哺乳动物征服了地球上每一片栖息地