vandalism破坏公物的行为; graffiti涂鸦; judge法官; gang(犯罪)团伙; sent them to prison送他们入狱; criminal damage刑事损害; maximum sentence最高刑罚; got off lightly(被)从轻判决; got nine months被判九个月的徒刑; youth detention centre少年拘留所
