Regarding the question of slaves and slaves that many book friends are entangled in.

Slave, originally refers to men and women who lost their freedom and were enslaved, and later refers to male and female servants; eunuchs refer to themselves as emperors and concubines. In the old days, it refers to people who lost their freedom and served unpaid labor for their masters. Its sources include sinners, captives and their families, as well as those who bought them from poor families. Usually men are called slaves and women are called maids. Later, it was also used as a general term for male and female servants. "Historical Records Jizheng Biography": "Chen Yu thought that His Majesty got the Hu people, and they all thought that they were slaves and maids to give to those who died in the army." Jin Yuanhong's "Later Han Ji Ji Di Ji": "Or take the good people as slaves, the name is called 'Being sold to the people', to a thousand people." Tang Hanyu's "Liu Zihou Epitaph": "It is customary for men and women to pledge money and redeem them from time to time. : "There are also vends who sell people and take them as slaves for the rich and noble."

——From Baidu Encyclopedia!