our century has seen great changes in their lives and living conditions of human beingsEverything we do today, seem to be less than a hundred years ago can not be implementedNo one can imagine that, people can fly or listen to music away from thousands of miles awayToday, radio and television serves many purposes in addition to entertainmentThey help us to find the fish in the sea and landing craft in bad weather or in the darknessThey also control the activity of many industrial machinery
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