work hard.

1.work hard. He read and studied about medicine. In the daytime, he learnt how to treat patients from his father. At night, he read books on medicine. 2.Not afraid of hardship. For the next 30 years, he was roaming between the mountains looking for medical herbs. He interviewed people. He collected almost all the different kinds of herbs. Then, he drew detailed sketches of them. At last, Li Shizhen finished his masterpiece – Bencao Gangmu at the age of 60.