cheat by selling inferior
Jade and jade is an idiom, interpretation: show people is jade, sell people is stone, meaning the same as "hang sheep's head, sell dog meat.".
It means "hanging sheep's head and selling dog meat".
Chinese PinYin : xián yù jiǎ shí
cheat by selling inferior
To separate the poor from the poor. fēn pín zhèn qióng
symbols of young men 's good conduct. zhī lán yù shù
To judge the past from the present. zhuó gǔ zhǔn jīn
Toss the earth and lift the sand. bǒ tǔ yáng shā