This is the general idea of poetry creation, using the artistic techniques of arousing emotions or borrowing scenery to express feelings and blending scenes. If you are answering a middle school question, you can answer it like this: in the first half of the poem, the author used the method of melting feelings into scenery and metaphor to render a cold atmosphere and express the author's anxiety and depression by describing images such as smoke, cold water, moonlight and sand; The first sentence also pointed out the characteristics of cold weather at that time. At the same time, the second sentence points out the time, place and people at that time, and "near the restaurant" paves the way for the second half of the poem.
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The author is dissatisfied. Because "backyard flowers" is the voice of national subjugation, when the country is declining, the rulers are still having fun regardless of the national disaster. The author felt extremely resentful and worried.
Blurred and cold. The combination of smoke, water, moon and sand depicts the hazy, desolate and cold atmosphere along the Qinhuai River, which lays the sad tone of the whole poem.