I have been to Zhouzhuang Town near Shanghai. Its characteristic tourism products are Wansan hoof and Wansan cake. These two things are the necessary dishes and snacks for Shen Wansan, a rich man in the south of the Yangtze River, to entertain distinguished guests. Therefore, the registered trademarks of other ancient towns cannot be copied. Now it has become a characteristic tourism product of Zhouzhuang.