Sonar

['səʊnɑː] or ['sonɑr]

解释:

(noun.) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; 'sonar is an acronym for sound navigation ranging'; 'asdic is an acronym for antisubmarine detection investigation committee'.

录入:莱斯特--From WordNet