Lesson 109    Discovering Africa    David Livingstone was a doctor and explorer from Scotland. He is famous for traveling 29,000 miles in Africa during the 19th century. He discovered many rivers, lakes and mountains, including the Victoria Falls, the biggest waterfall in the world. Most of all, he is highly respected because he helped to abolish slave trade in Africa.    探索非洲    大卫。李文斯顿是来自苏格兰的医生及探险家。他于19世纪在非洲旅行了 29000 英里而声名大噪。他发现了许多河流、湖泊和山峦，包括比界上最大的瀑布——维多利亚瀑布。更重要的是，他因促成废除非洲的奴隶买卖而备受尊敬。