What is epochal change?

The method of surgically transplanting cells, tissues, or organs of an individual to another part of one's body, or to a certain part of another body, is called transplantation. An individual who donates an organ is called a donor; The individual who receives the organ is called the recipient. If the donor and recipient are the same individual, it is called autologous transplantation, such as amputated limb replantation; If the donor and recipient belong to the same species, but not the same individual, it is called allogeneic transplantation, such as organ transplantation between people, and rejection will occur after transplantation; Transplantation between different species, called xenotransplantation, will be very violent after transplantation, such as transplanting a dog's kidney to a person; Transplantation between identical twins, although the donor and recipient are not the same individual, but the twins have exactly the same genetic structure and do not produce rejection after transplantation, is called homogeneous transfer.

During the Spring and Autumn Period and the Warring States Period, iron oxen ploughing was counted once, which greatly promoted the development of productive forces, led to the collapse of the well field system, and pushed it into feudal society. The first industrial revolution of the 18th century, the advent of Watt's improved steam engine, also greatly promoted the development of productive forces, he transformed the factory handicraft industry into a factory, and established the capitalist mode of production. Then there is the second industrial revolution at the end of the 19th century and the beginning of the 20th century, the emergence of electricity, the emergence of internal combustion engines, the transformation of productive forces, and the final formation of the capitalist world market.

Finally, there is the third scientific and technological revolution after World War II, that is, information technology.

Epoch-making means to open up a new era, which means that history is of great significance and can shine in the annals of history.

The epoch is all the objective circumstances that can affect people's consciousness. The era is by no means simply equivalent to the era, the era is a concept of time and space that is closely related to people, such as what is the student era?

Because the era is all the objective environment that can affect people's consciousness, so the student era is all the objective environment that can affect the consciousness of students, which of course includes the concept of time - the student period, and more importantly, it also includes all the objective environments that affect students' consciousness, such as the family environment, the school environment, the social environment, etc.

China in the Western Zhou.

1046 BC - 771 BC) entered the feudal era, to the Eastern Zhou Dynasty (770 BC - 256 BC) "cut five cities today, cut ten cities tomorrow" The princes are all infant city self-defense, if invited far-fetched will be counted as the castle era is not bad, in fact, it is still the feudal Sui Dynasty.

By the time Qin Shi Huang unified China (221BC), China had already entered the imperial era. As for the Age of Sail, the Maritime Silk Road during the Tang Dynasty.

It prospered, but it just declined. Then it was the era of colonization. Finally, the whole human world became one......

Change means changing the nature of things. Interpretation: 1Change, reform. 2.Change of dynasty...It refers to the abolition of the old system and the establishment of a new one.

Explain in detail. 1.Change, reform. "The Book of Rites: The Great Biography":

Measure the weight, test the article, correct Shuo, easy to wear color, special emblem, different equipment, other clothes, this its income and the people of the change. "Song Zeng Gong "Summoning the Judgment of Taichang Temple from Fuzhou":"The change follows, and the order must be believed, so that the sea can observe and listen, and it will not be shaken.

Sun Li, "Xiulu Collection: About Poems":"The times are determining the change in the form of poetry. "

2.Change of dynasty...Ming Xu Fang "Master Zhu's Sixty Birthday Preface":"At the time of change, mourning is frequent. "

3.It refers to the abolition of the old system and the establishment of a new one. Preamble to the Constitution of the People's Republic of China:"In the 20 th century, China underwent earth-shaking and great historical changes. "