... echo-sounding instrument 回声测深仪 echo depth sounding 回声测深 ; 回音测深 echo-sounding receiver 回声测深接收机 ...
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短语
回音测深仪
fathometer
;
echo depth sounder
多射束回音测深仪
multiple-beam echo sounder
回音测深机
echo sounding machine
超音波回声测深仪
supersonic echo sounder