a good distance off的用法和样例：
- It's safest to remain a good distance behind in case the car in front suddenly stops.
- The militiamen pursued him a good distance before they caught him.
- The police car remained a good distance behind the suspect.
- The boy's a good distance away,I don't have to slow down.
- Most mansions are a good distance from the nearest road.
- The new scheme got off to a good start.