单词：sonars
(sonar 的复数) n. 声纳
[计] 声纳
[计] 声纳
plural of sonar
n. 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
n. 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