Introduction to the Dalong Temple: The plaque hanging in the Dalong Temple was inscribed by Emperor Yongzheng, with the four characters "Lingyuan Puze" written on it. This plaque is more than 2 meters long and 80 centimeters wide. There are 9 dragon heads carved on the plaque. The four words "Lingyuan Puze" are exactly what Emperor Yongzheng said about the black well brine that benefited the world at that time.