ur discussion, you might first consider the things they replaced. A sample description is given below for your reference.РBallpoint penРcalculatorРlight bulbРrefrigeratorРSampleРThe ballpoint pen replaced pen and ink. It is more convenient, easy to carry and often neater.? The calculator replaced mental calculations, tables and the abacus. The results are more accurate, the problems can be done more quickly, plex operations with large sums can be done easily.? The light bulb replaced candles, lamps and torches. Electricity can be used at any time of the day or night. With electric lights, people no longer had to depend on sunlight.? The refrigerator replaced other ways of preserving food such as ice, salt and drying. It enables people to keep vegetables and other foods fresh for many days.
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