This is an attachment, a tribute to Mulan. She used an interesting metaphor to eulogize and praise Mulan's unknown caution and agility in disguised as a man instead of her father in the army 12 years.

Summarize with metaphor. Using the metaphor of two rabbits running together, it is difficult to tell the male from the female, which skillfully answers the mystery that Mulan disguised as a man instead of her father to join the army 12 years, which is interesting and memorable.