柯林斯詞典sonar /?s??nɑ?/ (sonars) 1. N-VAR Sonar is equipment on a ship which can calculate the depth of the sea or the position of an underwater object using sound waves. 聲納 返回 sonar劍橋詞典equipment , especially on a ship , that uses sound waves to discover how deep the water is or the position of an object in the water , such as a group of fish 聲納，聲吶（一種聲波探測儀器，用聲波測定水的深度或水下物躰的方位） 返回 sonar