1. The electronic computer is undoubtedly one of the greatest inventions of the 20th century. From the calculation of human brain to the calculation of computer, human beings have realized the miracle that "human brain creates computers and computers promote human brain".

Two people are thousands of miles away from Qianshan, but as long as they pick up the phone and dial a few numbers, they can hear each other's voice and communicate with each other in a few minutes. This is a miracle that the telephone has brought to mankind. The telephone has been invented 100 years. In modern society, it has become an important part of people's work and life.

3. Materially speaking, it is more and more "easy" to treat diseases by using electric heaters in cold weather, air conditioners in hot weather, electric kettles for boiling water and refrigerators for freezing ... all these are reflected in all aspects of material life. Mentally speaking, computers let us know more knowledge from the network ocean, and the melody played by audio enriches our hearts. Movies, TV and telephone have greatly enriched our spiritual life.

Cars, ships, high-speed trains, airplanes and other means of transportation have greatly facilitated human life.