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cell phone is very popular and used widely recent years.with cell phone,people can,any time,contact friends,talk to families and send blessing sms to the beloved person.however,except enjoying so many convineiences,cell phone also has some negative effects on us.radiation generated by cell phone is harmful to healthy; specially,ring bells may disturb others.for example,if you are sleeping at noon break in the office,a sudden ring call may shock you from a dream; when all the students are listening to the teacher,a loud ring bell will interrupt the class and make others annoyed; or during a meeting,a call noices is really impolite to other attendants.so,people should know where and how to use cell phone properly,and just turn off your phone if it maybe disturbs others.