The last two sentences are about the night scene. Although fire is forbidden in the Cold Food Festival, favored officials can get candles specially given by the emperor, and light smoke fills the air at home. The poem is full of intoxication of the spring scenery of the imperial capital and praise of prosperity and tranquility, and at the same time it implies euphemistic irony. The whole poem is mainly about scenery description, realistic line drawing, rigorous structure, multiple turns, implicit brushwork and profound meaning.
Cold food: the name of the festival, one or two days before Tomb-Sweeping Day in the lunar calendar. Chronicle of Jingchu in Liang Zonggu of the Southern Dynasties: "One hundred and fifty days after the winter festival (that is, the winter solstice festival), there was a heavy rain, even rain, which was called cold food." Cold food is in March, and spring is strong. According to the ancient custom, the fire was forbidden for three days before and after cold food, which is said to commemorate the retreat of doctors in Jin State in the Spring and Autumn Period.
According to legend, meson tui assisted Jin Wengong and Zhong Er, and lived in seclusion in the mountains after returning home. Jin Wengong burned the mountain and forced him out. The meson pushed the tree and died. In memory of him, Jin Wengong forbade Jietui to make a fire and cook on the day of his death, and only ate cold food. The latter phase follows the custom, which is called "cold food and no fire". Or the old system that the cloud banned fire for several weeks had nothing to do with the death of meson tui. The title of the poem is "Cold Food Festival is a Thing".