They first appeared more than 400 million years ago 它们最早出现在四亿多年前

310. For these fish, size is everything.
     对这些鱼来说 大小决定一切
311. Big jaws have let this fringehead rule his strip of seafloor,
     巨大的颌令勃氏新热鳚 统治着它的海底地带
312. but they've also allowed a more infamous group of fish to rule the waves.
     但也使另一种更恶名昭彰的鱼类 统治海洋
313. They first appeared more than 400 million years ago
     它们最早出现在四亿多年前
314. and have been feared ever since.
     自那以来 一直威名显赫
315. They are
     它们就是
316. the sharks.
     鲨鱼

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 313 行