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聲納，又寫做聲吶，係種透過聲音嘅反射去探測水底嘅技術，通常用嚟搵潛艇或者沉船。[1]
![Thumb](#/media/File:Miinitraaleri_"Virsaitis"_vrakk.jpg)
聲納呢個名係由英文SONAR翻譯，而SONAR本身係簡寫，全名「sound navigation and ranging」，解做「聲音導航同測距」。
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