You are most likely talking about the radar, which scans and alerts the people on the submarine of other submarines, missiles, etc. nearby.
That would be the topic sentence.
Answer:
English is speaked in many places in the world
What do you mean? I don't get it.
In Shakespeare's Romeo and Juliet, Peter-- the Capulet servant-- wanted the musicians to play a happy tune because he wanted to ease his sorrowful heart. However, the musicians refused because playing a happy tune would be inappropriate.
