is to haul themselves up onto the beach where they were born 就是要爬上它们出生的海滩
before she's big enough to stand up for herself. 才能长到足够强大 能够保护自己
they made up three-quarters of all vertebrate life on land, 它们占据了陆地脊椎动物的四分之三
...in a crust up to three kilometers deep. 表层厚达三千米
If scaled up to human proportions, 如果按照人类的比例放大
They now make up over 80% of all animal species. 节肢动物 如今已占据所有动物物种的80%以上