these dolphins have taken on an ever tougher challenge. 这些海豚面临着一个巨大挑战

98. Together, they ride a wave, using it to carry them into the shallows
    它们一起赶着海浪,好让海浪把它们带到浅水域
99. and there, it will be easier to make the catch.
    这样,捕鱼就轻松多了
100. In Western Australia
     在澳大利亚西部
101. these dolphins have taken on an ever tougher challenge.
     这些海豚面临着一个巨大挑战
102. The fish have taken refuge close to the beach where the water is only a few centimeters deep.
     鱼儿们太靠近沙滩,而那里的水才几厘米深
103. Tail slapping is a method dolphins often use to stun their prey
     用有力的尾巴击晕猎物是海豚们常用的方法
104. but it doesn't seem to work here.
     不过在这里好像没有什么用处

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 101 行