For the smaller ones, there's refuge in the shallows... 较小的鱼 可以在浅海寻求庇护

170. Some grew to be monstrous predators.
     有一些长成了巨大而可怕的捕食者
171. In this fish-eat-fish world,
     在这个鱼吃鱼的世界
172. it pays to be big.
     大就是好
173. For the smaller ones, there's refuge in the shallows...
     较小的鱼 可以在浅海寻求庇护
174. where their unique lobed fins are a distinct advantage.
     在那里 它们独特的叶鳍是一种明显的优势
175. Muscular and highly versatile,
     它们肌肉发达且随机应变
176. they are different to those of other fish.
     叶鳍与其他鱼的鳍不同

来自《我们星球上的生命 第一季 第三集 Life on Our Planet S01E03 入侵大地》第 173 行