Mating on land can be an awkward affair. 在陆地上交♥配♥有时是一件尴尬的事
...so can focus all his energy on finding a mate. 所以可以把全部精力放在觅偶上
On land, that armor supported them 在陆地上 这护甲支撑着它们
The first animals to ever set foot on land were the arthropods. 率先踏上陆地的动物是节肢动物
the most visible signs of life on our planet. 植物 是我们星球上的生命最鲜明的标志
...and how it changed everything for life on our planet. 以及它如何彻底改变地球上的一切
So perfect that, from this moment on, 如此完美 以至于从这一刻开始
have helped cephalopods colonize every ocean on Earth. 帮助头足动物 占据了地球上每一片海洋
With little food on offer, down here, they're rare. 在这里 食物很少 因此它们的数量也很稀少