These cubs will stay with their mother for nearly two years... 小豹会与母亲待在一起将近两年
as it has done for millions of years. 几百万年来一直如此
allowed their primate ancestors to survive in the forest of 50 million years ago. 使它们的灵长类祖先 能够在5000万年前的森林中存活下来
A supersense honed over millions of years of foraging in the darkness. 这是在数百万年夜间觅食的过程中 磨练出来的超凡感官
In the four billion years of life on our planet, 地球生命的40亿年历程中