英语口语，用一分钟介绍奥巴马，单词简单一些

American President Barack Obama was born in 1961, his father is black and his mother is white.His parents divorced and he had a harsh life in his childhood.He studied hard and obtained a Ph.D. from Harvard. In 2008, he became the first black president in U.S. history. He is an xxcellent speaker, and a lot of people were inspired by his famous speech yes, We can.His optimistic and self-confidence gives us hope and encouragement, I really admire him, and encourge us to move forward during difficult times.