While ice never completely engulfed the planet, 尽管冰雪从未覆盖整个地球
The teenager will never stray from the herd again. 这只小象再也不会离队
He's never seen a Doedicurus up close, 它从未如此近距离见过巨犰狳
something that would challenge mammals as never before. 这将对哺乳动物提出前所未有的挑战
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
Dinosaurs never conquered the oceans, 恐龙从未征服海洋
dinosaurs thrived like never before. 得到了前所未有的兴旺发展
they can never let down their guard... 也绝不能放松戒备