Mao Zedong, a great man who once dominated China's political arena and led the working people in China to overthrow the three mountains and bury the exploitation system, walked more than 20 miles to borrow books from relatives and friends when he was a child because he had no money to buy books. Go out to herd cattle during the day and study hard under the dim soybean oil lamp at night. It is this spirit of pursuing knowledge and perseverance that has given him lofty ideals and ambitions and made him an outstanding people's leader in China. Gorky, a famous writer, has experienced the bitterness of the world since he was a child. Although he was tired of work, he refused to give up reading for a moment. He often plagiarized other people's works at the urging of his boss and eventually became a famous writer. Edison, a great American inventor, couldn't afford books and experimental equipment at home when he was a child, so he collected bottles and cans everywhere. Once, he did an experiment on the train and accidentally caused an explosion. The conductor slapped him in the face and he was deaf. The hardships of life and physical defects did not discourage him. He studied harder and eventually became a world-famous scientist.