but rainbow runners are swift and agile and not easily caught 但是香蕉鱼游的敏捷迅速,白鳍鲨不容易捉到

48. enable it to soar through the water, with the least expenditure of energy.
    可以让它花费很小的力量在水里巡游
49. This shark has found a school of rainbow runners.
    鲨鱼发现了一群香蕉鱼
50. It would eat one, given the chance
    这给了鲨鱼一个机会
51. but rainbow runners are swift and agile and not easily caught
    但是香蕉鱼游的敏捷迅速,白鳍鲨不容易捉到
52. so, it bides it's time.
    因此鲨鱼耐心等候
53. There's a chance that, eventually, it may spot a weakened fish that's catchable.
    可能到最后可以找到一条 容易抓到的老弱的鱼
54. The hunter endlessly waiting.
    猎人,还在无尽的等待着

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 51 行