China's ancient science and technology, naturally, can't help but say that the four great inventions of ancient times, the compass, papermaking, printing and gunpowder, are not only the symbols of the prosperity of ancient science and technology in China, but also the embodiment of the wisdom of the people of China. More importantly, they have changed the process of modern human civilization to some extent. In other words, if there were no four ancient civilizations in China, perhaps human society would not be like this today. This is not China's boast, because historians all over the world agree that China's four great inventions, after being spread to Europe through Arabs, have had a great impact on European society, thus affecting the whole process of mankind. In this regard, Marx once spoke highly of it, which is the three great inventions to predict the arrival of bourgeois society, and he missed one. Gunpowder blew knights to pieces, compass gave birth to colonies, and printing became a tool to promote Protestantism. Generally speaking, it has become a means of scientific revival.

One is gunpowder, which was invented by us. What did gunpowder bring us? Brought our fireworks and firecrackers. So far, gunpowder has played a great role in our history. After being spread to Europe via Arabia, Europeans used gunpowder technology to make cannons, namely 1840' s first opium war and 1860' s second opium war, and 1900' s Sino-Japanese War and Eight-Nation Alliance's entry into Beijing. The Yuanmingyuan in China was burned with China's gunpowder. Empire declines, civilization declines. The Chinese nation with 5,000 years of civilization invented gunpowder, but did not use its own gunpowder to make powerful foreign guns. Instead, they can only use their own flesh and blood to resist foreigners' attacks and let their hands trample on the land of China. We have to cede territory to pay compensation and humiliate our country.

Compass, our Zheng He used the compass to make seven voyages to the West, which initiated the Chinese national culture to the world. They are missionaries, and the people of China have always been friendly. We didn't go to the west to plunder or rob. But once our invention was used by them, they created a new and more dexterous compass, broke into our territorial waters, opened our doors, smuggled a large amount of opium into our nation, and turned our nation into the "sick man of East Asia".

Our printing, printing and papermaking are great inventions of China. After it spread to Europe, it took hundreds of years to benefit society. The blazing torch of the Chinese nation lit up the dark middle ages in the west, and they really benefited a lot. Their technology developed and the Renaissance came, but what about our papermaking today? What about our printing? Our company has a deputy general manager who is proficient in printing. He designs our products every day. The best printing machine in China is called "Heidelberg", which is a movable type printing technology invented by us, but now the best printing machine is "Heidelberg", and four-color printing and exquisite printing are printed by others. The best paper is made by others, which is cheap and of good quality. What newspaper do you want? Please give me twenty-eight coppers. What do you want? To be imported. We invented paper, but the best machine is in people's hands. How much do we need to spend? Now even the best inks are imported, which should arouse our reflection.

Now let's review what the four great inventions have brought us. It has indeed brought eternal glory to the Chinese nation. Besides, who really benefited from it today? We have to admit that even if we have a lot of original innovations, we often miss the opportunity, further development and large-scale industrialization because we can't keep improving and develop slowly. For example, China people invented Yin He's gossip, but they didn't invent binary technology. Computers were invented by foreigners. Zheng He's Cold Never Born is an unprecedented creative concept, which is very remarkable. However, the second law of thermodynamics derived from this was formally put forward by a German after 1800 years. It is impossible to introduce hot objects from cold objects for free, and we have not gained regular experience.