The fire was shining in the sky, and the red star in the purple smoke was in chaos.
On the night of the moon, copper smelters sang, and their songs resounded through the cold valley.
Kulang refers to a copper smelter. Nan, originally meant to be shy and blush, here means that the workers' faces are red by fire. A fine poem, a vivid and magnificent picture emerges: at the foot of the towering Tongguan Mountain, groups of copper smelting furnaces are lined up in turn, and the flames are moving, and the fire reflects the red copper smelting field for half a night. Smoke wrapped around Mars is also reflected as purple. In the bright moonlight, the faces of those copper smelters were also reflected as red as fire. However, the workers' labor enthusiasm is very high, and the chorus of labor trumpets makes the river in the distance radical. This highly infectious poem is the first masterpiece describing workers' labor in the history of China literature, which has a high literary status and value.