Zhu Ziqing's back was described several times. What are their functions?

A * * * wrote four times in the book:

They are:

The first time: "What I can't forget is his back": The back here is empty, indicating that the author misses his father and cares about his back.

The second time: "At this time, I saw his back": The back here is real writing, and I hope my father will buy oranges and portray his back.

The third time: "Wait for his back to blend in with the people coming and going": The same is true of the back here, and the father and son bid farewell to the back.

The fourth time: "I saw a chubby back, a blue cotton gown and a black jacket": The back here was empty, and later I missed you and reappeared.

Extended data:

The Back is the representative work of Zhu Ziqing's early prose. His later prose is more refined and mature, closer to spoken English, but lacks the touching feelings of his earlier prose. ?

This is followed by a reminiscence essay written by modern writer Zhu Ziqing at 1925. This article tells the story that the author left Nanjing for Peking University. His father sent him to Pukou Station to take care of him and buy him oranges. What impressed me the most was the back of my father climbing up and down the platform when he bought him oranges.

With simple words, the author expresses his father's love for his children deeply, delicately and sincerely, and shows his care and love from ordinary events. ?

After the outbreak of War of Resistance against Japanese Aggression, he moved with the school and became a professor at National Southwest Associated University. The reality made him gradually establish the revolutionary democratic thought. After successfully returning to Beijing, he continued to teach in Tsinghua University and actively participated in mass movements and student movements against reactionaries. He refused to buy American "relief food" under the condition of poverty and illness, showing noble national integrity and patriotism, and was respected by the people of China.

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