因数的定义

　　After four decades of reporting from the continent, Jonathan Dimbleby returns to Africa on a 7,000-mile journey to discover how it is changing. 　　【Mali, Ghana and Nigeria】 　　He starts his African journey in the capital of Mali, Bamako, the fastest-growing African city. Following the course of the Niger river, Dimbleby finds not a continent of beggars but of industrious people, some... (展开全部)