音标：['æzdik] ；

n. 潜艇探索器的一种

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

词型变化：名词复数形式 : asdics

【近义词】

sonar声纳
echo sounder回声探测器

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学英语单词

a killer

a tenant by courtesy

acrosyndesis(percival 1932)

arteriae palatina ascendens

auxiliary haulage level

balagula