农奴

例句：

1. 1. The ancient Chinese were known for their strict social hierarchy and the oppression of slaves.
   古代中国人以其严格的社会等级制度和对奴隶的压迫而闻名。
2. 2. In some African societies, slavery was a common practice where people were forced to work for others.
   在一些非洲社会中，奴隶制是一种常见的做法，人们被迫为他人工作。
3. 3. The emancipation of slaves marked a significant turning point in human history.
   奴隶解放标志着人类历史上的一个重大转折点。