柯林斯词典sonar /ˈsəʊnɑː/ (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. 声纳 返回 sonar剑桥词典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 声纳，声呐（一种声波探测仪器，用声波测定水的深度或水下物体的方位） 返回 sonar