Structurally: (1) insert a metaphor sentence into the narrative, so that the narrative is temporarily interrupted, thus avoiding straightforward narrative and taking in everything in a glance; (2) The inserted bi xing sentence plays a suggestive role in the content, from which readers can realize that women's married life is not happy, so the narrative clue seems to be broken; (3) The first half of the poem is written before marriage and the second half is written after marriage, which plays a transitional role.
Content: ① Bixing sentences evoke rich associations. "Mulberry leaves flourish before it falls" and "Mulberry leaves wither when it falls". Generally speaking, compared with the moisturizing and aging of women's faces, it is inferred that women's aging is an important reason for the change of "self-protection".