Bingxin went to the sea of books at the age of 7. What does the sea of books mean?

Bingxin left the sea of books at the age of seven, which meant that she left her hometown of Fuzhou, Fujian Province, to study in Beijing around the year 1900. At that time, Beijing was a place with a flourishing culture and many excellent books and literary journals. Bingxin's father sent her to a private school in Beijing to give her a better education. Bing Xin studied many traditional culture and literary works in the private school, such as classic novels such as Dream of the Red Chamber and Water Margins, as well as Confucian classics such as The Analects of Confucius and Mencius. She also learned how to write and wrote many beautiful poems and essays in her school diary. Because Bingxin loved reading, her father gave her a name,"Xie Wanrong", which meant "the mother of books". Later, her mother gave her a pen name,"Ice Heart", which meant "Ice Heart". Bingxin became a famous literary girl and later became a famous translator and social actician in modern times.