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%
by forming alliances with nature. 摆脱了狩猎和采集的不确定性
...and average global temperatures fluctuated by less than one degree Celsius, 全球平均气温波动不到1摄氏度
...replaced by a vast expanse of dry forest and grassland. 被一大♥片♥干燥的森林和草原所取代
They are guided by an old female, the matriarch, 它们由一头年长的雌性即女族长带领
His time down here is limited by how long he can hold his breath. 它在水下的时间 受限于它能屏住呼吸的时间
...attracted by the abundance of food hidden beneath the waves. 它们被海浪之下的丰富食物所吸引