They've never seen water before. 它们以前从未见过水

50. There may be plenty of prey around,
    虽然猎物众多
51. but lions struggle to run it down in water.
    但狮子并不擅长在水中捕猎
52. The pride has three-month-old cubs.
    狮群中有三个月的幼崽
53. They've never seen water before.
    它们以前从未见过水
54. If their mothers don't make a kill soon,
    如果母狮们短时间内捕不到猎物
55. the cubs might not survive the week.
    这些幼崽可能撑不过这周
56. But fuelled by the flood,
    受洪水滋养

来自《行星地球 第二季 第五集 Planet Earth S02E05 草原》第 53 行