bái píng
píng kōng ; háo gēn Out of thin air; no base  píng kōngháo gēn qīng wáng zhī shū quán shuō · zhōng yōng shí zhāng 》: zōu yǎn liúzhí shì zuò wàng xiǎng bái píng zhuàn chūyòu suǒ yǐn