5. What does Gongye Chang mean by filial piety? The carp in Wang Xiang lies on the ice?

Metaphor children filial piety parents.

From Wang Xiang's Carp Sleeping on the Ice. [Allusions] In ancient times, there was a well-known dutiful son named Wang Xiang. One winter, her mother was seriously ill in bed, and she talked about wanting to eat carp. Wang Xiang looked at her dying mother with heartache, but it was freezing, and rivers were frozen three feet everywhere. It is impossible to salvage a carp. Wang Xiang came to the frozen river and dug and dug, but the thick ice was not destroyed. Finally, he stripped off his clothes and fell on the ice, hoping to melt a piece of ice with his body temperature so as to salvage carp for his mother. Gradually, he was exhausted and almost froze to death. Perhaps his filial piety touched the whole river. Just then, two fresh carp broke the ice and jumped in front of Wang Xiang. He went home with two carp. It is said that Wang Xiangguan later accepted the post of Taibao.