By sending out sounds which bounce back like echoes, a dolphin can tell if a rock or a fish lies ahead of it in the water!
通过像回声一样反弹发出的声音，海豚可以在水里分辨是岩石或者是一条鱼在它前面！
The sounds bounce off rock layers below the sea floor and are picked up by the phones.
声波从海底之下的岩层反射回来并由检波器接收。
The sounds bounce off rock layers below the sea floor and are picked up by the phones.
声波从海底之下的岩层反射回来并由检波器接收。
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