echolocation /ˌɛkəʊləʊˈkeɪʃən/ (alsoecho-location)

• 1.  

  N-UNCOUNT（不可数名词） Echolocation is a system used by some animals to determine the position of an object by measuring how long it takes for an echo to return from the object. 回声定位 [技术]

  例：

  Most bats navigate by echolocation.

  大多数蝙蝠通过回声定位飞行。