Introduction to the second door: The second foyer is about 8 meters away from the main door. The second door is 3.3 meters high and 2.5 meters wide, with water flowing on the north and south sides. Entering the second door, you are faced with an openable and closable wooden carved screen door, 3.1 meters wide and 3.4 meters high. It is mainly used for important activities and inspections by superiors.