2. Discrimination of idioms
"Picking up the remains" means picking up the remains to fill the gaps. That is, to supplement what others lack.
3. The source of ancient books
"Biography of Jin Shu Jiang Tong": "I am loyal to my thoughts and have made up for it, but I can make up for it." "Biography of Li Han in the Draft of Qing Dynasty": "It is the responsibility of the prime minister to replace her husband's contribution; It is also the official responsibility to fill the gaps. "