Sima Qian angrily wrote the last section of historical records. What can be written by the last word in the sentence and what does 520000 words explain

Sima Qian angrily wrote the last section of historical records. What can be written by the last word in the sentence and what does 520000 words explain

The last paragraph is a high-level summary of the writing process of historical records. The specific numbers of "13" and "52" in the sentence, as well as the words of "whole", "finally", "unprecedented", "exhausted", "life written" and so on, both reflect the unprecedented great achievements of historical records, have great historical value and literary value, and reflect the infinite hardships of completing this great work, It embodies Sima Qian's great spirit of devoting himself to the cause