A sensory system in certain animals,such as bats and dolphins,in which usually high-pitched sounds are emitted and their echoes interpreted to determine the direction and distance of objects.

• 回声定位，某些动物，如蝙蝠、海豚等的感觉系统，通常能发出高音频的声音并能根据回声来判断物体的方位及距离。