For example, Urs Peter Ruf of the University of Bielefeld in Germany has documented the evolution of master-slave relations in modern Mauritania.
For example, Urs Peter Ruf of the University of Bielefeld in Germany has documented the evolution of master-slave relations in modern Mauritania.
举例来说，德国俾勒菲特大学的鲁夫，将现代茅利塔尼亚中主人╱奴隶关系的演变，做了详细的描述。