Mankind made great progress in the 20th century. The 20th century is the beginning of "modern civilization". There is a great difference between "modern civilization" and "civilization before the 20th century". We can simply call "civilization before the 20th century" human civilization, which has a history of 5000 to 10000 years. First of all, "human civilization" develops slowly, while "modern civilization" develops rapidly and changes with each passing day. Secondly, during the period of "human civilization", people used simple low-level tools, from stone tools, bronzes and ironware to machinery. "Modern civilization" uses advanced tools, starting with electricity and developing into airplanes, computers, atomic energy, modern communication and biological engineering. Third, "modern civilization" relies far more on science than "human civilization". Although some things were invented in the19th century, such as cars, their real application and development was in the 20th century. Human production activities are increasingly inseparable from science, so "modern civilization" is also "modern scientific civilization". The achievements of scientific research today determine the rise and fall of a country. This is true not only for a country, but also for a company or a university. Science and teaching are inseparable and are the two pillars of "modern civilization".

2 1 century The enjoyment of ordinary people far exceeds that of Empress Dowager Cixi. She doesn't have a TV set or a refrigerator, so she can only take a bridge carried by eight people, not to mention airplanes, the Internet and advanced medical technology. It is not difficult to find that "modern civilization" in the 20th century has two stages. Around the end of World War II. There were four great inventions before the war. (1), an Englishman Maxwell, mathematically deduced the equation of electromagnetic wave and predicted its existence. 1900, German Hertz discovered electromagnetic waves in experiments. Italian Marconi invented wireless telegraph, and American Bell invented wired telephone, which initiated intercontinental communication. (2) 1886, Stem invented the first car, and in July of the same year, Mercedes-Benz invented the spark plug. 1906 Ford used assembly lines to produce cars, which reduced the cost. Created modern means of transportation. (3) The invention and application of engine, motor and AC drive have opened the curtain of electrification. Because there were no computers and robots at that time, Lenin put forward: "* * * capitalism is the Soviet Union plus electrification." (4) 1903, the Wright brothers in the United States invented the plane and began to fly by plane. War also promoted the research of weapons. In World War I, the Germans used gas bombs and submarines, while the British used armored vehicles. In World War II, the Germans invented missiles, the British invented radar, and the Americans invented jets and atomic bombs.