| 词汇 | sonar | 
| 释义 | sonar  noun [ U ] uk/ˈsəʊ.nɑːr/ us/ˈsoʊ.nɑːr/  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) 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 Compare: echo sounderradar | 
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