simply feeding ourselves takes up more than half of all habitable land... 养活我们自己 要占用超过一半的可栖息土地
So when the Ice Age hit two and a half million years ago, 所以 2500万年前 当冰河时代突然袭来之时
With a head like a pickaxe and standing two and a half meters tall, 骇鸟的头像锄头 站立高达2.5米
the firestorm of choking dust has enveloped half the planet. 窒息粉尘的火焰风暴已笼罩半个地球
half the size of the United States... 有半个美国那么大
An area half the size of the United States 一个面♥积♥相当于半个美国的区域
At over two and a half meters long and a half meter wide, 长度超过2.5米 宽度超过半米