? Teachers' "old three": speaking Mandarin, writing chalk characters, and drawing sketches. Teachers' "new three": playing with cell phones, playing with WeChat, and engaging in online and offline integrated teaching.

? "Minimalist education technology" refers to the school teaching work, advocating teachers and students to use convenient, practical, easy to learn, easy to use, can effectively improve the efficiency of work and learning technology.

"Minimalist education technology" has the following three characteristics: First, easy to grasp: easy to learn, easy to use, convenient, time-saving, no learning barriers. Second, problem solving: practical, effective, and able to solve practical problems in the workplace. Third, improve efficiency:Reduce the intensity of work, improve the efficiency and quality of teaching.

? What kind of educational technology is most welcome by teachers? Those that can be learned and used, those that can reduce the burden, those that can enhance the creativity of labor, and those that can promote the professional development of teachers.

The four revolutions in education were put forward by Eric Ashby, a famous British botanist and educator, in a presentation entitled "Technology in Education" at the Technion in Israel in 1966. The first was the emergence of the school, which shifted the responsibility for educating young people from the family to professional teachers. The second was the emergence of writing as an educational tool as important as the spoken word. The third was the invention of the printing press and the use of textbooks for education, and the fourth was the application of electronics and information technology to education, which is happening now.

? In ancient China, Confucius used bamboo slips as a carrier of learning; in 1029 recitation Wang Weiyi cast the world's earliest medical teaching with acupuncture meridian acupuncture (shu) point bronze man, known as the world's earliest multimedia teaching materials; in 1632 Comenius wrote the "theory of the Great Teaching", known as the pioneer of media teaching and visualization of teaching in the Western educational community.

The evolution of the American Educational Communication and Technology Association's definitions of educational technology: the 1994 definition, the 2008 definition, and the 2017 definition. The definitions are ***identical in that they are characterized by a focus on the proper and rational use of technology in the service of education to improve the efficiency and effectiveness of teaching and learning, to make learning more interesting, to make students more engaged, and to make their thinking more active, and thus to improve the quality of student learning.

? The evolution of the definition of China's electrified education: China's early electrified education (1915-1949), the electrified education in the early period of the People's Republic of China and the People's Republic of China (1949-1978), the restart of electrified education in the stage of full-scale development (1978-2010),Entering the stage of informatized education after the 21st century (2010-),After 2018, the informatization of education in China has developed from 1.0 development to 2.0, informatized education into a new stage of mobile Internet, artificial intelligence, big data, 5G, Internet of Things, etc. to promote great changes in education.

The development of information technology requires that "the road is simple".