? What does poverty mean? What are the allusions?

The source of the allusion: Tang Han's Wo poem "Give a Step of Cuichu River Poetry": "The white head is poor and the secret is clear, and the castle peak is in danger. Idiom meaning: Hao: white; First: hair; Poor classics: concentrate on learning classics and ancient books. Until Laobai, I was still studying classics and ancient books. Idiom phonetic notation: ㄠˋㄕㄡˇㄑㄩˊㄐㄧㄥㄥㄥㄥㄥㄥㄥㄥㄥㄥ. Idiom structure: orthographic subject-predicate idiom: Jing, which can't be pronounced as "Jin"; Hao, can't pronounce it as "ba": OK, can't write "OK"; Classic, can't write "path". English translation: Never too old to learn the old idiom riddle: Never too old to learn the old synonym: to grow old together is poor in classics, never tired of learning, but strong in old age. Example: Professor Wang is 90 years old and is still tirelessly sorting out the history of ancient Chinese literature. He is a model for young scholars.