Slavery began a very long time ago. 奴隶制度源远流长。

　　People bought slaves with money. 人们用钱买奴隶。

　　Sometimes slaves' lives were miserable. 有时奴隶的生活很悲惨。

　　Some people treated slaves as animals. 有些人把奴隶当作畜生。

　　Abraham Lincoln, the 16th president of the USA was against slavery. 美国第16任总统亚伯拉罕·林肯曾反对奴隶制度。

　　He fought to make slaves free from their owners. 他为解放奴隶而斗争。

　　However, believe it or not, 27,000,000 people are still slaves in the world. 但不管你相不相信，世界上仍有2700万的奴隶。