The whole sentence of Answer to Li Shuyi is: "I lost my pride, Yang Jun lost my willow, and the willow went straight to the sky." .
First of all, "I lost my pride, and Yang Jun lost her willow tree", which is associated with the surnames of two martyrs "Yang" and "Liu". This idea is brilliant. "Yang" should be Mao's first wife Yang Kaihui; Liu should refer to Li's husband. At that time, they both died, so "I lost my pride and Yang Jun lost my willow".
Secondly, the expression of "Liu Qingpiao" expresses deep condolences and infinite regrets, bringing readers into a beautiful and lofty realm.
Using the polysemy and homophonic conditions of words, a sentence is intentionally made to have a double meaning, that is, pun. Puns can make language express implicit humor, deepen meaning and leave a deep impression on people. Therefore, it is a typical pun to refer to both the real willow and the two martyrs.