What are the characteristics of the ending of the Summer Palace?

There is foreshadowing before, and there is concern after. According to the online public information query, the ending of the Summer Palace has the characteristics of foreshadowing before and caring after, which can make the content more complete and the structure more compact, causing * * * sound. The so-called echo means that there must be a very close relationship between the beginning and the end, and it is the explanation, explanation and narrative of the same situation as 1.