Extracurricular reading materials are very helpful for learning.
Tips
usage
读物 is a general term for anything meant to be read. Common collocations: 课外读物 (kèwài dúwù, extracurricular reading), 儿童读物 (értóng dúwù, children's books), 科普读物 (kēpǔ dúwù, popular science reading).
