> kuāng 
jiàn shí guǎng Yu knowledge is not widely   jiàn shí guǎng。《 sān guó zhì · shǔ zhì · zhèng chuán》: guǎn kuī kuāng shǒu jué suǒ jiànwèi yán hóng zhī xíng lièxìn wàn shì zhī jīng liàn