The author classifies the characters according to their qualities and deeds, and organizes the materials in subheadings. Features: clear and focused; Exquisite sentences and neat structure; Profound in content and ingenious in form.

2, narrative, editing description, discussion and explanation.

Various flexible expressions. For example, when explaining how Yuan Longping discovered the truth, he traced the process of Yuan Longping's scientific practice by flashback (it was a challenging day in July 196 1-): discovering special rice (joy) → nursing special rice (hope) → trying to grow special rice (disappointment) → analyzing and researching (confidence) → discovering truth (harvest).