echo-sounding apparatus

См. также в других словарях:

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• Echo — n. & v. n. (pl. oes) 1 a the repetition of a sound by the reflection of sound waves. b the secondary sound produced. 2 a reflected radio or radar beam. 3 a close imitation or repetition of something already done. 4 a person who slavishly repeats… …   Useful english dictionary

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