and salamanders have poor eyesight. 而且它们的视力也很差

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
49. and salamanders have poor eyesight.
    而且它们的视力也很差
50. But sensory nodes on their head and body
    可是它们头上和身上的感官突起
51. detect the slightest changes in water pressure.
    能觉察出最轻微的水压变化
52. Free from competition,
    由于没有竞争

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 49 行