A shoal of fish will do this.

鱼群也反射声音。

Most recently, he has modelled the behaviour of shoals of fish.

最近，他建立了鱼群行为模型。

This will give some idea of the havoc it makes among shoals of fish.

由这可想而知，它是如何肆意蹂躏浅滩上的鱼类的。

So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.

从测定海深到测定鱼群，这一进展比较容易。

Every solid object will reflect a sound, varying according to the size and nature of the object. A shoal of fish will do this.

任何固体者反射声音，反射的声音因物体的大小和性质的不同而不同。鱼群也反射声音。

They do, however, have a very special talent for using their noises to find their way about the oceans and to locate shoals of fish. This is a kind of sonar - an echo-location system.

然而，海豚确实有特殊的才能，可以利用它们发出的声音在大海里探路和确定鱼群的位置。这是一种声纳装置，一种回声定位系统。

And, a week later, the sea around the Dragon Mountain -- which had previously been teeming with crabs and lobsters and shoals and shoals of fish -- was a great, underwater desert.

一周后，龙山周围的海域--以前盛产螃蟹、龙虾、浅滩和鱼群--变成了一片巨大的水下沙漠。