Sofar
/ˈsəʊfɑː(r)/(亦作SOFAR)
noun
mass noun
- a system in which the sound waves from an underwater explosion are detected and located by three or more listening stations, useful in determining the position at sea of survivors of a disaster声发（一种声定位测距法）。
词源
1940s: from So（und） f（ixing） a（nd） r（anging）.