slavery

Abraham Lincoln played a major role in the abolition of slavery in the United States.

(Chinese) 亚伯拉罕·林肯在美国废除奴隶制的过程中起到了主要作用。

Many historical societies were built on the labor of people kept in slavery.

(Chinese) 许多历史上的社会都是建立在受奴役者的劳动基础之上的。