The Palace Museum as one of the great buildings in the history of mankind, people who go to Beijing will certainly go to the Forbidden City to take a look, and it is difficult for people who have been there not to notice their presence, that is, the most inescapable these large water tanks, these neatly distributed behemoths, they are inside the water 600 years to maintain a liquid state, so what is the difference between the water in the tank?
