SONAR's Sentences and Contexts

Learn SONAR from sentences of classic books. The app collects 10,000 middle or hard words; input your word, you not only get its meaning and example, but also have sentences and their contexts from classic literatures.

 Sentences of sonar
n. a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
The researchers were drilling into a methane gas hot spot in the Laptev Sea from their fishing boat and trying to measure how much gas was released with their sonar.
Sentence in Classic: