We are living in a modern life and there are many inventions help people's lives better. The mobile phone is a good human invention ... we can talk with relatives in great distances or send messages to them by mobile phone. There are many students regularly use smart phones during school hours. that's not a good bit.even use the phone much can negatively affect human health. so we need to use the phone in a scientific way
đang được dịch, vui lòng đợi..