echo sounding
Alternative form of hematochezia
(transitive) To cut beforehand or in advance. / (transitive) To cut the front or forward part of (a thing)
musical saw
The technique of using reflected pulses of sound to determine depth or the location of objects (or fish) under water. / A particular measurement made using this technique.
調査船は海底を地図化し、魚群の位置を特定するために音響測深を用いた。
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