BBC听力 | 无垠深海 04
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Excitement far from land.
即使远离陆地也有刺激的事情。
A school of dolphin five hundred strong.
一群多达500条的真海豚。
They've sensed there's food around, and they're racing to catch up with it.
它们感觉到附近有食物，开始加速追赶。
The news has spread. Now a number of schools are on their way.
消息传开，大量的真海豚上路了。
They're heading towards the Azores, volcanic islands a thousand miles west of Portugal.
它们向亚速尔游去，葡萄牙以西1000英里的火山群岛。
The dolphin scan the water ahead with their sonar. They're close to their target.
海豚利用声纳扫描大海。已经接近目标。
This is it. Scad mackerel.
这就是了。竹荚鲭。
It's difficult for a single dolphin to catch the fish.
单只海豚想吃它们是很困难的。
To avoid wasting energy the work as a group.
为了避免浪费精力，它们进行团队合作。
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，
and there, other predators await them.
因为那里还有掠食者在等着鱼儿们.
Cory's shearwaters. They're waiting for the dolphin to drive the prey closer to the surface.
猛鹱。它们正在等着海豚把猎物赶上水面。
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。
and the dolphins block the baitball's retreat.
海豚们锁定了从海面撤退的鱼群。
The dolphins leave as soon as they've had their fill
海豚吃饱后迅速离开了，
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。
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