close relatives of today's deep-sea nautilus. 今天深海鹦鹉螺的近亲

273. Even its young, barely half its size, are fearsome predators.
     即便在幼年期 仅有一半大小 也是可怕的捕食者
274. And this juvenile has spotted something out in the blue.
     这条幼鱼在蓝色的海洋中有所发现
275. Ammonoids,
     菊石
276. close relatives of today's deep-sea nautilus.
     今天深海鹦鹉螺的近亲
277. Being a vertebrate,
     作为脊椎动物
278. Dunkleosteus has the pace to catch up with them.
     邓氏鱼的速度能够追上菊石
279. But the ammonoids boast a trick of their own...
     但是菊石也有自己的本领

来自《我们星球上的生命 第一季 第二集 Life on Our Planet S01E02 第一前线》第 276 行