having split away from Africa over 120 million years ago. 它在一亿两千万年前就已经脱离非洲大陆
Eggs that were laid a few weeks ago, at the start of the season 几周前下的蛋,在这个季节伊始
They were in their prime twenty million years ago 2000万年前它们就已经在这里
A seed that may have fallen only a few days ago, now bursts through the leaf litter. 几天前才落下的种子突然破土而出
And a century ago, the bison were reduced to barely 1,000. 一百年前 野牛的数量曾锐减至不到一千
500 years ago they supported one of the world's great civilisations 500年前 它们维系着 一个世界上最伟大的文明
all of which evolved from just one single ancestor isolated here thousands of years ago. 它们都是从一个数千年前 即被隔绝在此的祖先进化而来的