这是一种声纳装置，一种回声定位系统。

This is a kind of sonar - an echo-location system.

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深拖装置也用于旁侧扫描声纳、重力以及磁法勘探。

Deep tow devices are used for some side-scan sonar, gravity and magnetic surveys.

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深拖装置也用于旁侧扫描声纳、重力以及磁法勘探。

Deep tow devices are used for some side-scan sonar, gravity and magnetic surveys.

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