gēng 
yóu yán yìng Still made hard soil  yóu yán yìng 。《 guǎn · yuán》: xià gēng quán guō ruò děng xiào yǐn yán chāng yáo yún:“《 shì míng · shì tiān》: gēngjiān qiáng mào rán gēng wèi jiān shí zhī quán。”