But catching salmon in deep water is not that easy 但要想在深水中捕获鲑鱼可不太容易

63. he's spoilt for choice.
    早就盼着这个机会
64. This Canadian bear is very special -
    这只加拿大熊很特别
65. he's learnt to dive for his dinner.
    它学会了潜水捕猎
66. But catching salmon in deep water is not that easy
    但要想在深水中捕获鲑鱼可不太容易
67. and the cubs have lots to learn.
    熊崽们还要很多东西要学
68. The annual arrival of spawning salmon
    鲑鱼每年都会到河里产卵
69. brings huge quantities of food into these high rivers that normally struggle to support much life.
    于是这些平常只能勉强维持众多动物生计的 高山河流终于有了提供饕餮大餐的机会

来自《行星地球 第一季 第三集 Planet Earth S01E03 淡水》第 66 行