Vigorously pumping their tails, they work up some speed 用他们有力的尾巴加速

104. but it doesn't seem to work here.
     不过在这里好像没有什么用处
105. The fish are tantalizingly close but they're still out of reach,
     虽然已经很接近鱼儿了 急人的是还是差那么一点
106. so the dolphins try another technique.
     海豚于是开始用另一种技巧
107. Vigorously pumping their tails, they work up some speed
     用他们有力的尾巴加速
108. and then, they hydroplane.
     如同水上飞机般
109. Their momentum carries them right through the shallowest waters, and onto the fish.
     这种速度让它们穿越最浅的水域, 来到了鱼儿那里
110. Now they're in real danger of being stranded
     现在它们有搁浅的危险

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 107 行