able to hide in holes, had survived. 藏在洞中 幸存下来
The perfect conditions for life to flourish. 这是生命蓬勃发展的理想条件
there was a limit to how far they could rise. 它们的崛起受到限制
...that early mammals were confined to the shadows. 以至于早期的哺乳动物只能躲在暗处
For the most part, they were small, keeping to the trees... 在大部分情况下 它们都很小 在树上栖息
But they are not the only ones to have conquered the world. 但征服世界的不只有它们
they've found a way to thrive in almost every corner of the planet. 几乎在地球上的每一个角落繁荣发展
But thanks to the few survivors of the dinosaur family tree, 但由于恐龙族谱中的少数幸存者
allowed the penguins to exploit the seas like never before. 使企鹅能够 以前所未有的方法利用海洋