They begin their hunt at night. 夜幕降临 它们开始捕猎

42. Giant salamanders, world's largest amphibian,
    大鲵——世界上最大的两栖动物
43. almost two metres long.
    几乎能长到2米长
44. They're the only large predator in these icy waters.
    它们是这些冰水中唯一的大型掠食动物
45. They begin their hunt at night.
    夜幕降临 它们开始捕猎
46. These salamanders have an exceptionally slow metabolism.
    大鲵的新陈代谢十分缓慢
47. Living up to 80 years they grow into giants.
    它们能活80多年 因此长得十分巨大
48. The fish they hunt are scarce
    可供大鲵捕食的鱼非常稀少

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 45 行