“variable-depth sonar”的概念、定义、翻译、参考文献-科学参考

单词	variable-depth sonar
释义	variable-depth sonar [`ver·ē·ǝ·bǝl ¦depth `sō´när] ^ENGINEERING Sonar in which the projector and receiving transducer are mounted in a watertight pod that can be lowered below a vessel to an optimum depth for minimizing thermal effects when detecting underwater targets.
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