U1 She trained hard, so she became a great player later
She is one of the best table tennis player in the world
She started playing table tennis when she was five
When she stopped playing table tennis, she began to study at Tsinghua University, and then, seven years later, she completed her doctor's degree at Cambridge University
U2 There were few doctors, so he has to work very hard on his own
Norman Bethune is one of the most famous heroes in China
He helped lots of wounded soldiers during the Anti-Japanese War
