Now the shearwaters can dive down on them, descending to twenty meters or more 猛鹱出动了 它们可以潜至20米甚至更深来捉鱼

66. They drive the fish upwards, trapping them against the surface
    它们将鱼儿赶上海面,目的是诱捕它们
67. and there, other predators await them.
    因为那里还有掠食者在等着鱼儿们
68. Cory's shearwaters. They're waiting for the dolphin to drive the prey closer to the surface.
    猛鹱 正在等着海豚把猎物赶上水面
69. Now the shearwaters can dive down on them, descending to twenty meters or more
    猛鹱出动了 它们可以潜至20米甚至更深来捉鱼
70. and the dolphins block the baitball's retreat.
    海豚们锁定了从海面撤退的鱼群
71. The dolphins leave as soon as they've had their fill
    海豚吃饱后迅速离开了
72. and, at last, the mackerel sink below the diving range of the birds.
    最后,竹荚鲭也逃出了猛鹱的攻击范围.

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 69 行