Nowadays,mobile phone never fail to fascinate people all over the world,and it has already become a part of most of people's daily lives.Not only can it connects people who far from each other,but also be convenience to find someone when you want to talk some important things to him.However,the ring of mobile phone will make us embarrassed on some formal occasion such as meeting ,class.I am sure most of students have had a such experience that your mobile phone keep ringing in your class and the teacher become very angry.Moreover,it will require you to turn off your mobile phone to keep quiet in some public places,such as library ,hospital.If you break the regulation of these places you will be critisied by other people.Therefore,when you enjoy the convenience the mobile phone brings to you,you shoud be make sure it won't to bring noise to others.So ,turn off your mobile phone when it require.修改答复 上传/更换附件
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