Is there a metaphor in the poem? Is it called Bi Xing?

Yes, the famous sentence in "Send Tian Shuji Wu Home" says: "Like spring breeze, at night, 10,000 pears will blow away." This sentence compares snow white to pear flower.

The old horse lurks, aiming at a thousand miles. The martyrs were full of courage in their later years. -"The tortoise is long" Cao Cao

Ask how much sorrow you can have, just like a river flowing eastward. -"Yu Meiren" Li Yu

How much leisure, a wisp of smoke, the wind in the city, plum yellow rain. -"Jade Case"

The desert sand is like snow, and the Yanshan moon is like a hook. -"Ma Shi" Li He