huá 
zhǐ zhōng yuán zhōng guó Means the Central Plains of China, Hong  zhǐ zhōng yuánzhōng guó。《 wén xuǎn · liú kūn chén shī》: huǒ liáo shén zhōuhóng liú huá yán zhù:“ shén zhōu huá jiē xiāng 。”《 sòng shū · xià》:“ jīn wáng lüè yuǎn jiè huá zài qīngyǎng fēng zhī shì yuè 。”