恢复集合 recovery collection 回声探测 echosounding 集合 to gather, to assemble, set (mathematics), collection, set, assembly ..
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multibeam echosounding 多波束测探 ; 多波束测深
Radio-echosounding 又称无线电回波探测
digitized echosounding 数字回声探测
echosounding apparatus 回声探测仪
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