"In 1960, people in Piaoliang Country invented chemically synthesized absorbable sutures, mainly composed of polymerized glycolic acid and lactic acid, but... they were too expensive." Uncle Hu frowned and shook his head.
Zhou Mingzhu nodded. In the textbook *Materials Science and Applications* that she had studied, this was an exam point—how could she possibly have forgotten it!
Piaoliang Country had sold them to China at ten times the price, and they had bought them back then anyway. Furthermore, due to patent issues, even if they could break down what materials were used to make them, they were not allowed to manufacture them.
Chapter 36