echo sounder
noun [ C ] uk/ˈek.əʊ ˌsaʊn.dər/ us/ˈek.oʊ ˌsaʊn.dɚ/
(尤指船载)回声探测器
a piece of equipment, especially on a ship, that uses sound waves to discover water depth or the position of an object in the water
Compare: sonar
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