preventing clouds moving in from the south, and this casts a giant rain shadow 阻挡了从南飘来的浮云 只在大地上投下了巨大雨影
This is midsummer on the Tibetan plateau, 这是西藏高原的仲夏
This rich pasture once supported the greatest herds ever seen on our planet. 这里的大草原肥沃甘美 曾经养育着地球上最大的动物群落
Somewhere in this immense landscape there is food for them. 在这无边无际的大地上的某处 有它们所需要的食物
and throughout this time she will be very vulnerable. 而在这三周里 它将变得易受攻击
Nonetheless, this female must incubate her eggs for three weeks 然而 雌雪雁必须花三周的时间孵蛋
Five million birds make this journey every year. 每年有五百万只雪雁都是这样迁徙
For much of the time, they're scattered through this vast landscape, 瞪羚在大部分时间里 都各自流浪在这片广袤的大地上