slavery       
noun [ U ] uk/ˈsleɪ.vər.i/ us/ˈsleɪ.ɚ.i/
C1 奴隶制,蓄奴;奴隶身份
the activity of having slaves or the condition of being a slave
  Slavery still exists in many parts of the world. 在世界上许多地方奴隶制依然存在。 
 Millions of Africans were sold into slavery. 数百万非洲人曾被贩卖为奴。 
 - More examples
 - William Wilberforce campaigned for the abolition of slavery.
 - The American Civil War was fought between the North and the South partly over the issue of slavery.
 - Beneath the surface of contemporary West Indian life lurk memories of slavery.
 - France abolished slavery on April 27, 1848.
 - His African-American parents had fled from Kentucky to escape slavery.