How did the works of ancient Greece and Rome spread to this day?

Rome did not perish until the Middle Ages, so this part of ancient books was naturally preserved. In addition, after the rise of Islam, some of them were translated, and papermaking spread to Muslim areas at that time, so it was well preserved later.

Westerners began to come into contact with these things during the Crusades, especially during the Fourth Crusade, when the Crusaders treacherously attacked and plundered the capital of Rome, and soon after that, Italy began the Renaissance. Ancient Greek classics have been translated by western European countries, so they have been passed down to today.

In fact, Roman classics should still be lost a lot. There is no doubt that the mathematical level and medical level of Uighurs in the Middle Ages were better than those of western whites, and the shipbuilding of Uighurs was better than that of China at that time, but these technologies could not be better than those of Rome. However, because Rome died miserably in the end, it is not known how much his history was modified by western whites. Considering that China was destroyed by Mongols in 100, there was a very serious civilization dating, and the Qing Dynasty destroyed a large number of history books of Song and Ming Dynasties in 300 years, I personally think that the losses of Greek classics and Roman history books are only much more than this.