出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第180页（222字）
给人看的是玉，而卖给人的却是石头，意同“挂羊头，卖狗肉”，例这家小店老板，经常做炫玉贾石的勾当，欺骗顾客。
The owner of this small shop often makes dubious deals and sells inferior quality or imitation stuff to its customers．