that have evolved over millions of years. 非凡多样的生存策略
Although some deserts may not see rain for several years, 虽然有些沙漠也许数年都不会下雨
has received its highest rainfall in years. 迎来了近几年最大的降雨
It's been dry for 55 million years. 干旱已经持续了五千五百万年
Even in the ten years since the head of this family was born, 在家族首领出生的这十年里
She has ruled this stretch of river for five years. 她统治这一河段已有五年之久
300 years ago, this Hura tree began its race for light. 三百年前这棵响盒子就开始努力汲取阳光
She has devoted the last two years to raising her cub 雌雪豹花费了两年时间哺育幼崽
have shrunk by 50% in just 30 years. 在短短三十年内面积减少了百分之五十