Zhu Bao cake is an idiom in China, pronounced as b ǐ__o zhǐng, which means exchanging pearls for cakes, which is a metaphor for ending greed.

There is also a small allusion to this idiom. In the Tang Dynasty, He once visited an old man, asked him about Huang Baizhu's alchemy, and specially gave him a very big orb as a gift. If you sell the old ball, ask someone to sell it and give it back to you for bread. He Zhangzhi felt pity, and the salesman replied, "How can you succeed if you haven't removed it?" In the Tang Dynasty, Huang Ruirui "tasted Wang selling medicine and asked Huang Baizhu, leaving a big pearl. Old people get pearls, which makes cakes and happy food easy. The old man congratulated him on why the ball was selling cakes. He said, "How can this technology be realized without eliminating austerity?" .