In the third season of Li Xiang China, Li Lei described the hardships and greatness of the construction of the Hongqi Canal. On the site of Hongqi Canal, there are a group of iron girls. The homework of male migrant workers is to play with a single brazing rod in both hands, and the iron girl can play with a single brazing rod in one hand and a double brazing rod in the other, which doubles the efficiency. Everyone calls this classic homework scene "Phoenix Spreading its Wings".