(4). Refers to the palace gate. In the Han Dynasty, Zhao Yi wrote "Insulting the World and Illness": "Although you want to be loyal, the Tao will never be peaceful. Jiuzhong can neither open nor be arrogant. "
(5). It refers to the imperial palace and court. Tang Lulun's poem "Autumn Night is Things" says: "Lock the city in autumn for nine times, and the bright moon wears the Nangong Building."
(6) refers to the emperor. Don Li Yong's "Qing Zhang Revenge Qiong Biao": "It takes nine days to win a thousand miles." Ming anonymous "Ode to a Goldfinch": "When I entered the Forbidden City in the Ming Dynasty, I heard nine sounds." Qing Niu Xuan's sequel: "First of all, the treasure (magic weapon) ran away and was furious, killing the world."
(7). refers to the throne. "Dunhuang Quzi Jiuquanzi": "The male army of the team surprised the imperial palace, and Mo Jie entered the palace, just wanting to win nine weights."
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