Whose poem is "crossing the crane shadow in the cold pond"?

this is <; < Dream of Red Mansions > > In the seventy-sixth episode, Xiang Yun and Lin Daiyu exchanged poems for the last time.

Xiang Yun's first couplet "Crossing the Crane Shadow in the Cold Pond"

Lin Daiyu's second couplet "Burying the Flower Soul in Leng Yue"

"Cold Pond"-the last sentence was taken from Du Fu's poem "With Peidideng Xinjin Temple, Wang Shilang": "Cicadas gather ancient temples, birds. It is just right to hide Xiangyun's solitary shape in the future with the "crane shadow". The author once described her long "crane potential mantis shape".