奥巴马开始访问非洲三国
US President Barack Obama has arrived in Senegal on the first leg of a three-nation tour of Africa.
美国总统奥巴马已抵达塞内加尔开始非洲三国之行。
It is Mr Obama's second visit to the continent since he became president.
He is hoping to boost economic ties with the African countries and promote good governance - all the countries he is visiting have stable democracies.
The South African leg of his trip is expected to be overshadowed by the continuing critical condition of former President Nelson Mandela.
The White House has said it will defer to the wishes of Mr Mandela's family over whether Mr Mandela is well enough to receive a visit from him in hospital.
Mr Obama, who arrived in the Senegalese capital, Dakar, on Wednesday night with his family, is due to meet the country's President Macky Sall later on Thursday.