名詞 echolocation:

1. determining the location of something by measuring the time it takes for an echo to return from it
   同義詞：echo sounding

ech.o.lo.ca.tion

n.（名詞）
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.
回聲定位，回波定位：某些動物，如蝙蝠、海豚等的感覺系統(tǒng)，通常能發(fā)出高音頻的聲音并能根據(jù)回聲來判斷物體的方位及距離
Electronics A process for determining the location of objects by emitting sound waves and analyzing the waves reflected back to the sender by the object.Also called echo ranging
【電子學(xué)】 回聲定位法，回波定位法：一種通過先發(fā)出聲音，然后分析被物體反射回發(fā)送者的聲波并決定物體方位的方法也作 echo ranging

【引伸】
ech.olocate.
v.（動詞）